diff --git a/samples/client/petstore/python-asyncio/docs/Pet.md b/samples/client/petstore/python-asyncio/docs/Pet.md
index f9ea079075d1..9e15090300f8 100644
--- a/samples/client/petstore/python-asyncio/docs/Pet.md
+++ b/samples/client/petstore/python-asyncio/docs/Pet.md
@@ -5,7 +5,7 @@ Name | Type | Description | Notes
 ------------ | ------------- | ------------- | -------------
 **id** | **int** |  | [optional] 
 **category** | [**Category**](Category.md) |  | [optional] 
-**name** | **str** |  | [default to 'doggie']
+**name** | **str** |  | 
 **photo_urls** | **list[str]** |  | 
 **tags** | [**list[Tag]**](Tag.md) |  | [optional] 
 **status** | **str** | pet status in the store | [optional] 
diff --git a/samples/client/petstore/python-asyncio/docs/TypeHolderExample.md b/samples/client/petstore/python-asyncio/docs/TypeHolderExample.md
index 1a1535f4dee3..844b1a394c67 100644
--- a/samples/client/petstore/python-asyncio/docs/TypeHolderExample.md
+++ b/samples/client/petstore/python-asyncio/docs/TypeHolderExample.md
@@ -3,11 +3,11 @@
 ## Properties
 Name | Type | Description | Notes
 ------------ | ------------- | ------------- | -------------
-**string_item** | **str** |  | [default to 'what']
+**string_item** | **str** |  | 
 **number_item** | **float** |  | [default to 1.234]
-**integer_item** | **int** |  | [default to -2]
-**bool_item** | **bool** |  | [default to True]
-**array_item** | **list[int]** |  | [default to [0, 1, 2, 3]]
+**integer_item** | **int** |  | 
+**bool_item** | **bool** |  | 
+**array_item** | **list[int]** |  | 
 
 [[Back to Model list]](../README.md#documentation-for-models) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to README]](../README.md)
 
diff --git a/samples/client/petstore/python-asyncio/docs/XmlItem.md b/samples/client/petstore/python-asyncio/docs/XmlItem.md
index 929e09ef5294..e389f5a06c0f 100644
--- a/samples/client/petstore/python-asyncio/docs/XmlItem.md
+++ b/samples/client/petstore/python-asyncio/docs/XmlItem.md
@@ -3,33 +3,33 @@
 ## Properties
 Name | Type | Description | Notes
 ------------ | ------------- | ------------- | -------------
-**attribute_string** | **str** |  | [optional] [default to 'string']
+**attribute_string** | **str** |  | [optional] 
 **attribute_number** | **float** |  | [optional] [default to 1.234]
-**attribute_integer** | **int** |  | [optional] [default to -2]
-**attribute_boolean** | **bool** |  | [optional] [default to True]
+**attribute_integer** | **int** |  | [optional] 
+**attribute_boolean** | **bool** |  | [optional] 
 **wrapped_array** | **list[int]** |  | [optional] 
-**name_string** | **str** |  | [optional] [default to 'string']
+**name_string** | **str** |  | [optional] 
 **name_number** | **float** |  | [optional] [default to 1.234]
-**name_integer** | **int** |  | [optional] [default to -2]
-**name_boolean** | **bool** |  | [optional] [default to True]
+**name_integer** | **int** |  | [optional] 
+**name_boolean** | **bool** |  | [optional] 
 **name_array** | **list[int]** |  | [optional] 
 **name_wrapped_array** | **list[int]** |  | [optional] 
-**prefix_string** | **str** |  | [optional] [default to 'string']
+**prefix_string** | **str** |  | [optional] 
 **prefix_number** | **float** |  | [optional] [default to 1.234]
-**prefix_integer** | **int** |  | [optional] [default to -2]
-**prefix_boolean** | **bool** |  | [optional] [default to True]
+**prefix_integer** | **int** |  | [optional] 
+**prefix_boolean** | **bool** |  | [optional] 
 **prefix_array** | **list[int]** |  | [optional] 
 **prefix_wrapped_array** | **list[int]** |  | [optional] 
-**namespace_string** | **str** |  | [optional] [default to 'string']
+**namespace_string** | **str** |  | [optional] 
 **namespace_number** | **float** |  | [optional] [default to 1.234]
-**namespace_integer** | **int** |  | [optional] [default to -2]
-**namespace_boolean** | **bool** |  | [optional] [default to True]
+**namespace_integer** | **int** |  | [optional] 
+**namespace_boolean** | **bool** |  | [optional] 
 **namespace_array** | **list[int]** |  | [optional] 
 **namespace_wrapped_array** | **list[int]** |  | [optional] 
-**prefix_ns_string** | **str** |  | [optional] [default to 'string']
+**prefix_ns_string** | **str** |  | [optional] 
 **prefix_ns_number** | **float** |  | [optional] [default to 1.234]
-**prefix_ns_integer** | **int** |  | [optional] [default to -2]
-**prefix_ns_boolean** | **bool** |  | [optional] [default to True]
+**prefix_ns_integer** | **int** |  | [optional] 
+**prefix_ns_boolean** | **bool** |  | [optional] 
 **prefix_ns_array** | **list[int]** |  | [optional] 
 **prefix_ns_wrapped_array** | **list[int]** |  | [optional] 
 
diff --git a/samples/client/petstore/python-asyncio/petstore_api/models/pet.py b/samples/client/petstore/python-asyncio/petstore_api/models/pet.py
index 3183f60c7971..d3c412f4a82b 100644
--- a/samples/client/petstore/python-asyncio/petstore_api/models/pet.py
+++ b/samples/client/petstore/python-asyncio/petstore_api/models/pet.py
@@ -48,7 +48,7 @@ class Pet(object):
         'status': 'status'
     }
 
-    def __init__(self, id=None, category=None, name='doggie', photo_urls=None, tags=None, status=None):  # noqa: E501
+    def __init__(self, id=None, category=None, name=None, photo_urls=None, tags=None, status=None):  # noqa: E501
         """Pet - a model defined in OpenAPI"""  # noqa: E501
 
         self._id = None
diff --git a/samples/client/petstore/python-asyncio/petstore_api/models/type_holder_example.py b/samples/client/petstore/python-asyncio/petstore_api/models/type_holder_example.py
index 573354ab4d6e..dd4cd8cf202a 100644
--- a/samples/client/petstore/python-asyncio/petstore_api/models/type_holder_example.py
+++ b/samples/client/petstore/python-asyncio/petstore_api/models/type_holder_example.py
@@ -46,7 +46,7 @@ class TypeHolderExample(object):
         'array_item': 'array_item'
     }
 
-    def __init__(self, string_item='what', number_item=1.234, integer_item=-2, bool_item=True, array_item=[0, 1, 2, 3]):  # noqa: E501
+    def __init__(self, string_item=None, number_item=1.234, integer_item=None, bool_item=None, array_item=None):  # noqa: E501
         """TypeHolderExample - a model defined in OpenAPI"""  # noqa: E501
 
         self._string_item = None
diff --git a/samples/client/petstore/python-asyncio/petstore_api/models/xml_item.py b/samples/client/petstore/python-asyncio/petstore_api/models/xml_item.py
index 28e6ff376770..f3b3782de433 100644
--- a/samples/client/petstore/python-asyncio/petstore_api/models/xml_item.py
+++ b/samples/client/petstore/python-asyncio/petstore_api/models/xml_item.py
@@ -94,7 +94,7 @@ class XmlItem(object):
         'prefix_ns_wrapped_array': 'prefix_ns_wrapped_array'
     }
 
-    def __init__(self, attribute_string='string', attribute_number=1.234, attribute_integer=-2, attribute_boolean=True, wrapped_array=None, name_string='string', name_number=1.234, name_integer=-2, name_boolean=True, name_array=None, name_wrapped_array=None, prefix_string='string', prefix_number=1.234, prefix_integer=-2, prefix_boolean=True, prefix_array=None, prefix_wrapped_array=None, namespace_string='string', namespace_number=1.234, namespace_integer=-2, namespace_boolean=True, namespace_array=None, namespace_wrapped_array=None, prefix_ns_string='string', prefix_ns_number=1.234, prefix_ns_integer=-2, prefix_ns_boolean=True, prefix_ns_array=None, prefix_ns_wrapped_array=None):  # noqa: E501
+    def __init__(self, attribute_string=None, attribute_number=1.234, attribute_integer=None, attribute_boolean=None, wrapped_array=None, name_string=None, name_number=1.234, name_integer=None, name_boolean=None, name_array=None, name_wrapped_array=None, prefix_string=None, prefix_number=1.234, prefix_integer=None, prefix_boolean=None, prefix_array=None, prefix_wrapped_array=None, namespace_string=None, namespace_number=1.234, namespace_integer=None, namespace_boolean=None, namespace_array=None, namespace_wrapped_array=None, prefix_ns_string=None, prefix_ns_number=1.234, prefix_ns_integer=None, prefix_ns_boolean=None, prefix_ns_array=None, prefix_ns_wrapped_array=None):  # noqa: E501
         """XmlItem - a model defined in OpenAPI"""  # noqa: E501
 
         self._attribute_string = None
diff --git a/samples/client/petstore/python-tornado/docs/Pet.md b/samples/client/petstore/python-tornado/docs/Pet.md
index f9ea079075d1..9e15090300f8 100644
--- a/samples/client/petstore/python-tornado/docs/Pet.md
+++ b/samples/client/petstore/python-tornado/docs/Pet.md
@@ -5,7 +5,7 @@ Name | Type | Description | Notes
 ------------ | ------------- | ------------- | -------------
 **id** | **int** |  | [optional] 
 **category** | [**Category**](Category.md) |  | [optional] 
-**name** | **str** |  | [default to 'doggie']
+**name** | **str** |  | 
 **photo_urls** | **list[str]** |  | 
 **tags** | [**list[Tag]**](Tag.md) |  | [optional] 
 **status** | **str** | pet status in the store | [optional] 
diff --git a/samples/client/petstore/python-tornado/docs/TypeHolderExample.md b/samples/client/petstore/python-tornado/docs/TypeHolderExample.md
index 1a1535f4dee3..844b1a394c67 100644
--- a/samples/client/petstore/python-tornado/docs/TypeHolderExample.md
+++ b/samples/client/petstore/python-tornado/docs/TypeHolderExample.md
@@ -3,11 +3,11 @@
 ## Properties
 Name | Type | Description | Notes
 ------------ | ------------- | ------------- | -------------
-**string_item** | **str** |  | [default to 'what']
+**string_item** | **str** |  | 
 **number_item** | **float** |  | [default to 1.234]
-**integer_item** | **int** |  | [default to -2]
-**bool_item** | **bool** |  | [default to True]
-**array_item** | **list[int]** |  | [default to [0, 1, 2, 3]]
+**integer_item** | **int** |  | 
+**bool_item** | **bool** |  | 
+**array_item** | **list[int]** |  | 
 
 [[Back to Model list]](../README.md#documentation-for-models) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to README]](../README.md)
 
diff --git a/samples/client/petstore/python-tornado/docs/XmlItem.md b/samples/client/petstore/python-tornado/docs/XmlItem.md
index 929e09ef5294..e389f5a06c0f 100644
--- a/samples/client/petstore/python-tornado/docs/XmlItem.md
+++ b/samples/client/petstore/python-tornado/docs/XmlItem.md
@@ -3,33 +3,33 @@
 ## Properties
 Name | Type | Description | Notes
 ------------ | ------------- | ------------- | -------------
-**attribute_string** | **str** |  | [optional] [default to 'string']
+**attribute_string** | **str** |  | [optional] 
 **attribute_number** | **float** |  | [optional] [default to 1.234]
-**attribute_integer** | **int** |  | [optional] [default to -2]
-**attribute_boolean** | **bool** |  | [optional] [default to True]
+**attribute_integer** | **int** |  | [optional] 
+**attribute_boolean** | **bool** |  | [optional] 
 **wrapped_array** | **list[int]** |  | [optional] 
-**name_string** | **str** |  | [optional] [default to 'string']
+**name_string** | **str** |  | [optional] 
 **name_number** | **float** |  | [optional] [default to 1.234]
-**name_integer** | **int** |  | [optional] [default to -2]
-**name_boolean** | **bool** |  | [optional] [default to True]
+**name_integer** | **int** |  | [optional] 
+**name_boolean** | **bool** |  | [optional] 
 **name_array** | **list[int]** |  | [optional] 
 **name_wrapped_array** | **list[int]** |  | [optional] 
-**prefix_string** | **str** |  | [optional] [default to 'string']
+**prefix_string** | **str** |  | [optional] 
 **prefix_number** | **float** |  | [optional] [default to 1.234]
-**prefix_integer** | **int** |  | [optional] [default to -2]
-**prefix_boolean** | **bool** |  | [optional] [default to True]
+**prefix_integer** | **int** |  | [optional] 
+**prefix_boolean** | **bool** |  | [optional] 
 **prefix_array** | **list[int]** |  | [optional] 
 **prefix_wrapped_array** | **list[int]** |  | [optional] 
-**namespace_string** | **str** |  | [optional] [default to 'string']
+**namespace_string** | **str** |  | [optional] 
 **namespace_number** | **float** |  | [optional] [default to 1.234]
-**namespace_integer** | **int** |  | [optional] [default to -2]
-**namespace_boolean** | **bool** |  | [optional] [default to True]
+**namespace_integer** | **int** |  | [optional] 
+**namespace_boolean** | **bool** |  | [optional] 
 **namespace_array** | **list[int]** |  | [optional] 
 **namespace_wrapped_array** | **list[int]** |  | [optional] 
-**prefix_ns_string** | **str** |  | [optional] [default to 'string']
+**prefix_ns_string** | **str** |  | [optional] 
 **prefix_ns_number** | **float** |  | [optional] [default to 1.234]
-**prefix_ns_integer** | **int** |  | [optional] [default to -2]
-**prefix_ns_boolean** | **bool** |  | [optional] [default to True]
+**prefix_ns_integer** | **int** |  | [optional] 
+**prefix_ns_boolean** | **bool** |  | [optional] 
 **prefix_ns_array** | **list[int]** |  | [optional] 
 **prefix_ns_wrapped_array** | **list[int]** |  | [optional] 
 
diff --git a/samples/client/petstore/python-tornado/petstore_api/models/pet.py b/samples/client/petstore/python-tornado/petstore_api/models/pet.py
index 3183f60c7971..d3c412f4a82b 100644
--- a/samples/client/petstore/python-tornado/petstore_api/models/pet.py
+++ b/samples/client/petstore/python-tornado/petstore_api/models/pet.py
@@ -48,7 +48,7 @@ class Pet(object):
         'status': 'status'
     }
 
-    def __init__(self, id=None, category=None, name='doggie', photo_urls=None, tags=None, status=None):  # noqa: E501
+    def __init__(self, id=None, category=None, name=None, photo_urls=None, tags=None, status=None):  # noqa: E501
         """Pet - a model defined in OpenAPI"""  # noqa: E501
 
         self._id = None
diff --git a/samples/client/petstore/python-tornado/petstore_api/models/type_holder_example.py b/samples/client/petstore/python-tornado/petstore_api/models/type_holder_example.py
index 573354ab4d6e..dd4cd8cf202a 100644
--- a/samples/client/petstore/python-tornado/petstore_api/models/type_holder_example.py
+++ b/samples/client/petstore/python-tornado/petstore_api/models/type_holder_example.py
@@ -46,7 +46,7 @@ class TypeHolderExample(object):
         'array_item': 'array_item'
     }
 
-    def __init__(self, string_item='what', number_item=1.234, integer_item=-2, bool_item=True, array_item=[0, 1, 2, 3]):  # noqa: E501
+    def __init__(self, string_item=None, number_item=1.234, integer_item=None, bool_item=None, array_item=None):  # noqa: E501
         """TypeHolderExample - a model defined in OpenAPI"""  # noqa: E501
 
         self._string_item = None
diff --git a/samples/client/petstore/python-tornado/petstore_api/models/xml_item.py b/samples/client/petstore/python-tornado/petstore_api/models/xml_item.py
index 28e6ff376770..f3b3782de433 100644
--- a/samples/client/petstore/python-tornado/petstore_api/models/xml_item.py
+++ b/samples/client/petstore/python-tornado/petstore_api/models/xml_item.py
@@ -94,7 +94,7 @@ class XmlItem(object):
         'prefix_ns_wrapped_array': 'prefix_ns_wrapped_array'
     }
 
-    def __init__(self, attribute_string='string', attribute_number=1.234, attribute_integer=-2, attribute_boolean=True, wrapped_array=None, name_string='string', name_number=1.234, name_integer=-2, name_boolean=True, name_array=None, name_wrapped_array=None, prefix_string='string', prefix_number=1.234, prefix_integer=-2, prefix_boolean=True, prefix_array=None, prefix_wrapped_array=None, namespace_string='string', namespace_number=1.234, namespace_integer=-2, namespace_boolean=True, namespace_array=None, namespace_wrapped_array=None, prefix_ns_string='string', prefix_ns_number=1.234, prefix_ns_integer=-2, prefix_ns_boolean=True, prefix_ns_array=None, prefix_ns_wrapped_array=None):  # noqa: E501
+    def __init__(self, attribute_string=None, attribute_number=1.234, attribute_integer=None, attribute_boolean=None, wrapped_array=None, name_string=None, name_number=1.234, name_integer=None, name_boolean=None, name_array=None, name_wrapped_array=None, prefix_string=None, prefix_number=1.234, prefix_integer=None, prefix_boolean=None, prefix_array=None, prefix_wrapped_array=None, namespace_string=None, namespace_number=1.234, namespace_integer=None, namespace_boolean=None, namespace_array=None, namespace_wrapped_array=None, prefix_ns_string=None, prefix_ns_number=1.234, prefix_ns_integer=None, prefix_ns_boolean=None, prefix_ns_array=None, prefix_ns_wrapped_array=None):  # noqa: E501
         """XmlItem - a model defined in OpenAPI"""  # noqa: E501
 
         self._attribute_string = None