[python] fixes bugs (#13581)

* Adds bug fixes

* Samples and docs regenerated

* Samples regenerated

samples/openapi3/client/features/dynamic-servers/python/README.md

@@ -140,7 +140,7 @@ Please follow the [installation procedure](#installation--usage) and then run th
 import time
 import dynamic_servers
 from pprint import pprint
-from dynamic_servers.apis import usage_api
+from dynamic_servers.apis.tags import usage_api
 # Defining the host is optional and defaults to http://petstore.swagger.io:80/v2
 # See configuration.py for a list of all supported configuration parameters.
 configuration = dynamic_servers.Configuration(

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

@@ -1048,7 +1048,7 @@ class ApiClient:
     ) -> urllib3.HTTPResponse:
 
         # header parameters
-        headers = headers or {}
+        headers = headers or HTTPHeaderDict()
         headers.update(self.default_headers)
         if self.cookie:
             headers['Cookie'] = self.cookie

samples/openapi3/client/features/dynamic-servers/python/dynamic_servers/paths/custom/get.pyi

@@ -26,6 +26,24 @@ import frozendict  # noqa: F401
 from dynamic_servers import schemas  # noqa: F401
 
 SchemaFor200ResponseBodyApplicationJson = schemas.DictSchema
+
+
+@dataclass
+class ApiResponseFor200(api_client.ApiResponse):
+    response: urllib3.HTTPResponse
+    body: typing.Union[
+        SchemaFor200ResponseBodyApplicationJson,
+    ]
+    headers: schemas.Unset = schemas.unset
+
+
+_response_for_200 = api_client.OpenApiResponse(
+    response_cls=ApiResponseFor200,
+    content={
+        'application/json': api_client.MediaType(
+            schema=SchemaFor200ResponseBodyApplicationJson),
+    },
+)
 _all_accept_content_types = (
     'application/json',
 )

samples/openapi3/client/features/dynamic-servers/python/dynamic_servers/paths/default/get.pyi

@@ -26,6 +26,24 @@ import frozendict  # noqa: F401
 from dynamic_servers import schemas  # noqa: F401
 
 SchemaFor200ResponseBodyApplicationJson = schemas.DictSchema
+
+
+@dataclass
+class ApiResponseFor200(api_client.ApiResponse):
+    response: urllib3.HTTPResponse
+    body: typing.Union[
+        SchemaFor200ResponseBodyApplicationJson,
+    ]
+    headers: schemas.Unset = schemas.unset
+
+
+_response_for_200 = api_client.OpenApiResponse(
+    response_cls=ApiResponseFor200,
+    content={
+        'application/json': api_client.MediaType(
+            schema=SchemaFor200ResponseBodyApplicationJson),
+    },
+)
 _all_accept_content_types = (
     'application/json',
 )

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

@@ -1883,6 +1883,7 @@ class ComposedBase(Discriminable):
                 "Invalid inputs given to generate an instance of {}. Multiple "
                 "oneOf schemas {} matched the inputs, but a max of one is allowed.".format(cls, oneof_classes)
             )
+        # exactly one class matches
         return path_to_schemas
 
     @classmethod
@@ -1947,7 +1948,9 @@ class ComposedBase(Discriminable):
         )
 
         # process composed schema
-        discriminator = getattr(cls, 'discriminator', None)
+        discriminator = None
+        if hasattr(cls, 'MetaOapg') and hasattr(cls.MetaOapg, 'discriminator'):
+            discriminator = cls.MetaOapg.discriminator()
         discriminated_cls = None
         if discriminator and arg and isinstance(arg, frozendict.frozendict):
             disc_property_name = list(discriminator.keys())[0]