[Python] add '_spec_property_naming' param (#11226)

* add '_spec_property_naming' param

* add '_spec_property_naming' comment

Co-authored-by: jiangyuan04 <jiangyuan04@baidu.com>

modules/openapi-generator/src/main/resources/python/api.mustache

@@ -270,6 +270,10 @@ class {{classname}}(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -301,6 +305,9 @@ class {{classname}}(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')

modules/openapi-generator/src/main/resources/python/api_client.mustache

@@ -694,7 +694,8 @@ class Endpoint(object):
             '_return_http_data_only',
             '_check_input_type',
             '_check_return_type',
-            '_content_type'
+            '_content_type',
+            '_spec_property_naming'
         ])
         self.params_map['nullable'].extend(['_request_timeout'])
         self.validations = root_map['validations']
@@ -708,6 +709,7 @@ class Endpoint(object):
             '_return_http_data_only': (bool,),
             '_check_input_type': (bool,),
             '_check_return_type': (bool,),
+            '_spec_property_naming': (bool,),
             '_content_type': (none_type, str)
         }
         self.openapi_types.update(extra_types)
@@ -744,7 +746,7 @@ class Endpoint(object):
                 value,
                 self.openapi_types[key],
                 [key],
-                False,
+                kwargs['_spec_property_naming'],
                 kwargs['_check_input_type'],
                 configuration=self.api_client.configuration
             )

samples/client/petstore/python/petstore_api/api/another_fake_api.py

@@ -119,6 +119,10 @@ class AnotherFakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -150,6 +154,9 @@ class AnotherFakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')

samples/client/petstore/python/petstore_api/api/fake_api.py

@@ -1132,6 +1132,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -1163,6 +1167,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -1199,6 +1206,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -1230,6 +1241,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -1268,6 +1282,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -1299,6 +1317,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -1337,6 +1358,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -1368,6 +1393,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -1404,6 +1432,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -1435,6 +1467,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -1471,6 +1506,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -1502,6 +1541,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -1538,6 +1580,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -1569,6 +1615,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -1607,6 +1656,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -1638,6 +1691,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -1679,6 +1735,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -1710,6 +1770,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -1752,6 +1815,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -1783,6 +1850,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -1831,6 +1901,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -1862,6 +1936,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -1926,6 +2003,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -1957,6 +2038,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -2008,6 +2092,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -2039,6 +2127,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -2084,6 +2175,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -2115,6 +2210,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -2158,6 +2256,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -2189,6 +2291,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -2230,6 +2335,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -2261,6 +2370,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')

samples/client/petstore/python/petstore_api/api/fake_classname_tags_123_api.py

@@ -121,6 +121,10 @@ class FakeClassnameTags123Api(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -152,6 +156,9 @@ class FakeClassnameTags123Api(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')

samples/client/petstore/python/petstore_api/api/pet_api.py

@@ -584,6 +584,10 @@ class PetApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -615,6 +619,9 @@ class PetApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -655,6 +662,10 @@ class PetApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -686,6 +697,9 @@ class PetApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -726,6 +740,10 @@ class PetApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -757,6 +775,9 @@ class PetApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -797,6 +818,10 @@ class PetApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -828,6 +853,9 @@ class PetApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -868,6 +896,10 @@ class PetApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -899,6 +931,9 @@ class PetApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -938,6 +973,10 @@ class PetApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -969,6 +1008,9 @@ class PetApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -1010,6 +1052,10 @@ class PetApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -1041,6 +1087,9 @@ class PetApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -1083,6 +1132,10 @@ class PetApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -1114,6 +1167,9 @@ class PetApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -1156,6 +1212,10 @@ class PetApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -1187,6 +1247,9 @@ class PetApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')

samples/client/petstore/python/petstore_api/api/store_api.py

@@ -265,6 +265,10 @@ class StoreApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -296,6 +300,9 @@ class StoreApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -333,6 +340,10 @@ class StoreApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -364,6 +375,9 @@ class StoreApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -402,6 +416,10 @@ class StoreApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -433,6 +451,9 @@ class StoreApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -472,6 +493,10 @@ class StoreApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -503,6 +528,9 @@ class StoreApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')

samples/client/petstore/python/petstore_api/api/user_api.py

@@ -452,6 +452,10 @@ class UserApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -483,6 +487,9 @@ class UserApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -522,6 +529,10 @@ class UserApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -553,6 +564,9 @@ class UserApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -592,6 +606,10 @@ class UserApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -623,6 +641,9 @@ class UserApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -663,6 +684,10 @@ class UserApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -694,6 +719,9 @@ class UserApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -733,6 +761,10 @@ class UserApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -764,6 +796,9 @@ class UserApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -805,6 +840,10 @@ class UserApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -836,6 +875,9 @@ class UserApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -874,6 +916,10 @@ class UserApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -905,6 +951,9 @@ class UserApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -945,6 +994,10 @@ class UserApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -976,6 +1029,9 @@ class UserApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')

samples/client/petstore/python/petstore_api/api_client.py

@@ -673,7 +673,8 @@ class Endpoint(object):
             '_return_http_data_only',
             '_check_input_type',
             '_check_return_type',
-            '_content_type'
+            '_content_type',
+            '_spec_property_naming'
         ])
         self.params_map['nullable'].extend(['_request_timeout'])
         self.validations = root_map['validations']
@@ -687,6 +688,7 @@ class Endpoint(object):
             '_return_http_data_only': (bool,),
             '_check_input_type': (bool,),
             '_check_return_type': (bool,),
+            '_spec_property_naming': (bool,),
             '_content_type': (none_type, str)
         }
         self.openapi_types.update(extra_types)
@@ -723,7 +725,7 @@ class Endpoint(object):
                 value,
                 self.openapi_types[key],
                 [key],
-                False,
+                kwargs['_spec_property_naming'],
                 kwargs['_check_input_type'],
                 configuration=self.api_client.configuration
             )

samples/client/petstore/python_disallowAdditionalPropertiesIfNotPresent/petstore_api/api/another_fake_api.py

@@ -119,6 +119,10 @@ class AnotherFakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -150,6 +154,9 @@ class AnotherFakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')

samples/client/petstore/python_disallowAdditionalPropertiesIfNotPresent/petstore_api/api/fake_api.py

@@ -1132,6 +1132,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -1163,6 +1167,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -1199,6 +1206,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -1230,6 +1241,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -1268,6 +1282,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -1299,6 +1317,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -1337,6 +1358,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -1368,6 +1393,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -1404,6 +1432,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -1435,6 +1467,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -1471,6 +1506,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -1502,6 +1541,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -1538,6 +1580,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -1569,6 +1615,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -1607,6 +1656,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -1638,6 +1691,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -1679,6 +1735,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -1710,6 +1770,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -1752,6 +1815,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -1783,6 +1850,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -1831,6 +1901,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -1862,6 +1936,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -1926,6 +2003,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -1957,6 +2038,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -2008,6 +2092,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -2039,6 +2127,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -2084,6 +2175,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -2115,6 +2210,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -2158,6 +2256,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -2189,6 +2291,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -2230,6 +2335,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -2261,6 +2370,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')

samples/client/petstore/python_disallowAdditionalPropertiesIfNotPresent/petstore_api/api/fake_classname_tags_123_api.py

@@ -121,6 +121,10 @@ class FakeClassnameTags123Api(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -152,6 +156,9 @@ class FakeClassnameTags123Api(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')

samples/client/petstore/python_disallowAdditionalPropertiesIfNotPresent/petstore_api/api/pet_api.py

@@ -584,6 +584,10 @@ class PetApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -615,6 +619,9 @@ class PetApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -655,6 +662,10 @@ class PetApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -686,6 +697,9 @@ class PetApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -726,6 +740,10 @@ class PetApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -757,6 +775,9 @@ class PetApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -797,6 +818,10 @@ class PetApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -828,6 +853,9 @@ class PetApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -868,6 +896,10 @@ class PetApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -899,6 +931,9 @@ class PetApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -938,6 +973,10 @@ class PetApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -969,6 +1008,9 @@ class PetApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -1010,6 +1052,10 @@ class PetApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -1041,6 +1087,9 @@ class PetApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -1083,6 +1132,10 @@ class PetApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -1114,6 +1167,9 @@ class PetApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -1156,6 +1212,10 @@ class PetApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -1187,6 +1247,9 @@ class PetApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')

samples/client/petstore/python_disallowAdditionalPropertiesIfNotPresent/petstore_api/api/store_api.py

@@ -265,6 +265,10 @@ class StoreApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -296,6 +300,9 @@ class StoreApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -333,6 +340,10 @@ class StoreApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -364,6 +375,9 @@ class StoreApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -402,6 +416,10 @@ class StoreApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -433,6 +451,9 @@ class StoreApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -472,6 +493,10 @@ class StoreApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -503,6 +528,9 @@ class StoreApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')

samples/client/petstore/python_disallowAdditionalPropertiesIfNotPresent/petstore_api/api/user_api.py

@@ -452,6 +452,10 @@ class UserApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -483,6 +487,9 @@ class UserApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -522,6 +529,10 @@ class UserApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -553,6 +564,9 @@ class UserApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -592,6 +606,10 @@ class UserApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -623,6 +641,9 @@ class UserApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -663,6 +684,10 @@ class UserApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -694,6 +719,9 @@ class UserApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -733,6 +761,10 @@ class UserApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -764,6 +796,9 @@ class UserApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -805,6 +840,10 @@ class UserApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -836,6 +875,9 @@ class UserApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -874,6 +916,10 @@ class UserApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -905,6 +951,9 @@ class UserApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -945,6 +994,10 @@ class UserApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -976,6 +1029,9 @@ class UserApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')

samples/client/petstore/python_disallowAdditionalPropertiesIfNotPresent/petstore_api/api_client.py

@@ -673,7 +673,8 @@ class Endpoint(object):
             '_return_http_data_only',
             '_check_input_type',
             '_check_return_type',
-            '_content_type'
+            '_content_type',
+            '_spec_property_naming'
         ])
         self.params_map['nullable'].extend(['_request_timeout'])
         self.validations = root_map['validations']
@@ -687,6 +688,7 @@ class Endpoint(object):
             '_return_http_data_only': (bool,),
             '_check_input_type': (bool,),
             '_check_return_type': (bool,),
+            '_spec_property_naming': (bool,),
             '_content_type': (none_type, str)
         }
         self.openapi_types.update(extra_types)
@@ -723,7 +725,7 @@ class Endpoint(object):
                 value,
                 self.openapi_types[key],
                 [key],
-                False,
+                kwargs['_spec_property_naming'],
                 kwargs['_check_input_type'],
                 configuration=self.api_client.configuration
             )

samples/openapi3/client/extensions/x-auth-id-alias/python/x_auth_id_alias/api/usage_api.py

@@ -243,6 +243,10 @@ class UsageApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -274,6 +278,9 @@ class UsageApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -309,6 +316,10 @@ class UsageApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -340,6 +351,9 @@ class UsageApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -375,6 +389,10 @@ class UsageApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -406,6 +424,9 @@ class UsageApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -441,6 +462,10 @@ class UsageApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -472,6 +497,9 @@ class UsageApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')

samples/openapi3/client/extensions/x-auth-id-alias/python/x_auth_id_alias/api_client.py

@@ -673,7 +673,8 @@ class Endpoint(object):
             '_return_http_data_only',
             '_check_input_type',
             '_check_return_type',
-            '_content_type'
+            '_content_type',
+            '_spec_property_naming'
         ])
         self.params_map['nullable'].extend(['_request_timeout'])
         self.validations = root_map['validations']
@@ -687,6 +688,7 @@ class Endpoint(object):
             '_return_http_data_only': (bool,),
             '_check_input_type': (bool,),
             '_check_return_type': (bool,),
+            '_spec_property_naming': (bool,),
             '_content_type': (none_type, str)
         }
         self.openapi_types.update(extra_types)
@@ -723,7 +725,7 @@ class Endpoint(object):
                 value,
                 self.openapi_types[key],
                 [key],
-                False,
+                kwargs['_spec_property_naming'],
                 kwargs['_check_input_type'],
                 configuration=self.api_client.configuration
             )

samples/openapi3/client/features/dynamic-servers/python/dynamic_servers/api/usage_api.py

@@ -198,6 +198,10 @@ class UsageApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -229,6 +233,9 @@ class UsageApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -264,6 +271,10 @@ class UsageApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -295,6 +306,9 @@ class UsageApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')

samples/openapi3/client/features/dynamic-servers/python/dynamic_servers/api_client.py

@@ -673,7 +673,8 @@ class Endpoint(object):
             '_return_http_data_only',
             '_check_input_type',
             '_check_return_type',
-            '_content_type'
+            '_content_type',
+            '_spec_property_naming'
         ])
         self.params_map['nullable'].extend(['_request_timeout'])
         self.validations = root_map['validations']
@@ -687,6 +688,7 @@ class Endpoint(object):
             '_return_http_data_only': (bool,),
             '_check_input_type': (bool,),
             '_check_return_type': (bool,),
+            '_spec_property_naming': (bool,),
             '_content_type': (none_type, str)
         }
         self.openapi_types.update(extra_types)
@@ -723,7 +725,7 @@ class Endpoint(object):
                 value,
                 self.openapi_types[key],
                 [key],
-                False,
+                kwargs['_spec_property_naming'],
                 kwargs['_check_input_type'],
                 configuration=self.api_client.configuration
             )

samples/openapi3/client/petstore/python/petstore_api/api/another_fake_api.py

@@ -119,6 +119,10 @@ class AnotherFakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -150,6 +154,9 @@ class AnotherFakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')

samples/openapi3/client/petstore/python/petstore_api/api/default_api.py

@@ -107,6 +107,10 @@ class DefaultApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -138,6 +142,9 @@ class DefaultApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')

samples/openapi3/client/petstore/python/petstore_api/api/fake_api.py

@@ -1720,6 +1720,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -1751,6 +1755,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -1787,6 +1794,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -1818,6 +1829,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -1853,6 +1867,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -1884,6 +1902,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -1920,6 +1941,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -1951,6 +1976,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -1987,6 +2015,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -2018,6 +2050,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -2055,6 +2090,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -2086,6 +2125,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -2123,6 +2165,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -2154,6 +2200,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -2188,6 +2237,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -2219,6 +2272,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -2257,6 +2313,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -2288,6 +2348,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -2326,6 +2389,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -2357,6 +2424,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -2393,6 +2463,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -2424,6 +2498,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -2459,6 +2536,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -2490,6 +2571,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -2525,6 +2609,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -2556,6 +2644,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -2592,6 +2683,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -2623,6 +2718,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -2659,6 +2757,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -2690,6 +2792,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -2728,6 +2833,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -2759,6 +2868,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -2800,6 +2912,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -2831,6 +2947,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -2873,6 +2992,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -2904,6 +3027,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -2960,6 +3086,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -2991,6 +3121,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -3042,6 +3175,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -3073,6 +3210,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -3118,6 +3258,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -3149,6 +3293,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -3192,6 +3339,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -3223,6 +3374,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -3264,6 +3418,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -3295,6 +3453,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -3345,6 +3506,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -3376,6 +3541,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -3421,6 +3589,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -3452,6 +3624,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -3489,6 +3664,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -3520,6 +3699,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -3560,6 +3742,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -3591,6 +3777,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -3628,6 +3817,10 @@ class FakeApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -3659,6 +3852,9 @@ class FakeApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')

samples/openapi3/client/petstore/python/petstore_api/api/fake_classname_tags_123_api.py

@@ -121,6 +121,10 @@ class FakeClassnameTags123Api(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -152,6 +156,9 @@ class FakeClassnameTags123Api(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')

samples/openapi3/client/petstore/python/petstore_api/api/pet_api.py

@@ -472,6 +472,10 @@ class PetApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -503,6 +507,9 @@ class PetApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -543,6 +550,10 @@ class PetApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -574,6 +585,9 @@ class PetApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -614,6 +628,10 @@ class PetApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -645,6 +663,9 @@ class PetApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -685,6 +706,10 @@ class PetApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -716,6 +741,9 @@ class PetApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -756,6 +784,10 @@ class PetApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -787,6 +819,9 @@ class PetApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -826,6 +861,10 @@ class PetApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -857,6 +896,9 @@ class PetApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -898,6 +940,10 @@ class PetApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -929,6 +975,9 @@ class PetApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')

samples/openapi3/client/petstore/python/petstore_api/api/store_api.py

@@ -267,6 +267,10 @@ class StoreApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -298,6 +302,9 @@ class StoreApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -335,6 +342,10 @@ class StoreApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -366,6 +377,9 @@ class StoreApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -404,6 +418,10 @@ class StoreApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -435,6 +453,9 @@ class StoreApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -474,6 +495,10 @@ class StoreApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -505,6 +530,9 @@ class StoreApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')

samples/openapi3/client/petstore/python/petstore_api/api/user_api.py

@@ -460,6 +460,10 @@ class UserApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -491,6 +495,9 @@ class UserApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -530,6 +537,10 @@ class UserApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -561,6 +572,9 @@ class UserApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -600,6 +614,10 @@ class UserApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -631,6 +649,9 @@ class UserApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -671,6 +692,10 @@ class UserApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -702,6 +727,9 @@ class UserApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -741,6 +769,10 @@ class UserApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -772,6 +804,9 @@ class UserApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -813,6 +848,10 @@ class UserApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -844,6 +883,9 @@ class UserApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -882,6 +924,10 @@ class UserApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -913,6 +959,9 @@ class UserApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')
@@ -953,6 +1002,10 @@ class UserApi(object):
             _check_return_type (bool): specifies if type checking
                 should be done one the data received from the server.
                 Default is True.
+            _spec_property_naming (bool): True if the variable names in the input data
+                are serialized names, as specified in the OpenAPI document.
+                False if the variable names in the input data
+                are pythonic names, e.g. snake case (default)
             _content_type (str/None): force body content-type.
                 Default is None and content-type will be predicted by allowed
                 content-types and body.
@@ -984,6 +1037,9 @@ class UserApi(object):
         kwargs['_check_return_type'] = kwargs.get(
             '_check_return_type', True
         )
+        kwargs['_spec_property_naming'] = kwargs.get(
+            '_spec_property_naming', False
+        )
         kwargs['_content_type'] = kwargs.get(
             '_content_type')
         kwargs['_host_index'] = kwargs.get('_host_index')

samples/openapi3/client/petstore/python/petstore_api/api_client.py

@@ -680,7 +680,8 @@ class Endpoint(object):
             '_return_http_data_only',
             '_check_input_type',
             '_check_return_type',
-            '_content_type'
+            '_content_type',
+            '_spec_property_naming'
         ])
         self.params_map['nullable'].extend(['_request_timeout'])
         self.validations = root_map['validations']
@@ -694,6 +695,7 @@ class Endpoint(object):
             '_return_http_data_only': (bool,),
             '_check_input_type': (bool,),
             '_check_return_type': (bool,),
+            '_spec_property_naming': (bool,),
             '_content_type': (none_type, str)
         }
         self.openapi_types.update(extra_types)
@@ -730,7 +732,7 @@ class Endpoint(object):
                 value,
                 self.openapi_types[key],
                 [key],
-                False,
+                kwargs['_spec_property_naming'],
                 kwargs['_check_input_type'],
                 configuration=self.api_client.configuration
             )