diff --git a/modules/openapi-generator/src/main/resources/python/model_utils.mustache b/modules/openapi-generator/src/main/resources/python/model_utils.mustache
index 4a99eab52a..6be57468da 100644
--- a/modules/openapi-generator/src/main/resources/python/model_utils.mustache
+++ b/modules/openapi-generator/src/main/resources/python/model_utils.mustache
@@ -1182,6 +1182,9 @@ def is_valid_type(input_class_simple, valid_classes):
     Returns:
         bool
     """
+    if issubclass(input_class_simple, OpenApiModel) and \
+        valid_classes == (bool, date, datetime, dict, float, int, list, str, none_type,):
+        return True
     valid_type = input_class_simple in valid_classes
     if not valid_type and (
             issubclass(input_class_simple, OpenApiModel) or
diff --git a/modules/openapi-generator/src/test/resources/3_0/python/petstore-with-fake-endpoints-models-for-testing-with-http-signature.yaml b/modules/openapi-generator/src/test/resources/3_0/python/petstore-with-fake-endpoints-models-for-testing-with-http-signature.yaml
index c78f428360..9e347d3d33 100644
--- a/modules/openapi-generator/src/test/resources/3_0/python/petstore-with-fake-endpoints-models-for-testing-with-http-signature.yaml
+++ b/modules/openapi-generator/src/test/resources/3_0/python/petstore-with-fake-endpoints-models-for-testing-with-http-signature.yaml
@@ -1643,6 +1643,8 @@ components:
           properties:
             breed:
               type: string
+            legs:
+              $ref: '#/components/schemas/Legs'
     Cat:
       allOf:
         - $ref: '#/components/schemas/Animal'
@@ -1650,6 +1652,19 @@ components:
           properties:
             declawed:
               type: boolean
+    Legs:
+      type: object
+      required:
+        - legs
+      properties:
+        legs:
+          enum:
+            - '2'
+            - '4'
+          default: '4'
+          x-enum-as-string: true
+        name:
+          type: string
     Address:
       type: object
       additionalProperties:
diff --git a/samples/client/petstore/python/petstore_api/model_utils.py b/samples/client/petstore/python/petstore_api/model_utils.py
index e7ef88f64f..955ad1cba4 100644
--- a/samples/client/petstore/python/petstore_api/model_utils.py
+++ b/samples/client/petstore/python/petstore_api/model_utils.py
@@ -1479,6 +1479,9 @@ def is_valid_type(input_class_simple, valid_classes):
     Returns:
         bool
     """
+    if issubclass(input_class_simple, OpenApiModel) and \
+        valid_classes == (bool, date, datetime, dict, float, int, list, str, none_type,):
+        return True
     valid_type = input_class_simple in valid_classes
     if not valid_type and (
             issubclass(input_class_simple, OpenApiModel) or
diff --git a/samples/client/petstore/python_disallowAdditionalPropertiesIfNotPresent/petstore_api/model_utils.py b/samples/client/petstore/python_disallowAdditionalPropertiesIfNotPresent/petstore_api/model_utils.py
index e7ef88f64f..955ad1cba4 100644
--- a/samples/client/petstore/python_disallowAdditionalPropertiesIfNotPresent/petstore_api/model_utils.py
+++ b/samples/client/petstore/python_disallowAdditionalPropertiesIfNotPresent/petstore_api/model_utils.py
@@ -1479,6 +1479,9 @@ def is_valid_type(input_class_simple, valid_classes):
     Returns:
         bool
     """
+    if issubclass(input_class_simple, OpenApiModel) and \
+        valid_classes == (bool, date, datetime, dict, float, int, list, str, none_type,):
+        return True
     valid_type = input_class_simple in valid_classes
     if not valid_type and (
             issubclass(input_class_simple, OpenApiModel) or
diff --git a/samples/openapi3/client/extensions/x-auth-id-alias/python/x_auth_id_alias/model_utils.py b/samples/openapi3/client/extensions/x-auth-id-alias/python/x_auth_id_alias/model_utils.py
index cef4b6c237..5331409b63 100644
--- a/samples/openapi3/client/extensions/x-auth-id-alias/python/x_auth_id_alias/model_utils.py
+++ b/samples/openapi3/client/extensions/x-auth-id-alias/python/x_auth_id_alias/model_utils.py
@@ -1479,6 +1479,9 @@ def is_valid_type(input_class_simple, valid_classes):
     Returns:
         bool
     """
+    if issubclass(input_class_simple, OpenApiModel) and \
+        valid_classes == (bool, date, datetime, dict, float, int, list, str, none_type,):
+        return True
     valid_type = input_class_simple in valid_classes
     if not valid_type and (
             issubclass(input_class_simple, OpenApiModel) or
diff --git a/samples/openapi3/client/features/dynamic-servers/python/dynamic_servers/model_utils.py b/samples/openapi3/client/features/dynamic-servers/python/dynamic_servers/model_utils.py
index 2ad3e5bdea..7b10ed60cf 100644
--- a/samples/openapi3/client/features/dynamic-servers/python/dynamic_servers/model_utils.py
+++ b/samples/openapi3/client/features/dynamic-servers/python/dynamic_servers/model_utils.py
@@ -1479,6 +1479,9 @@ def is_valid_type(input_class_simple, valid_classes):
     Returns:
         bool
     """
+    if issubclass(input_class_simple, OpenApiModel) and \
+        valid_classes == (bool, date, datetime, dict, float, int, list, str, none_type,):
+        return True
     valid_type = input_class_simple in valid_classes
     if not valid_type and (
             issubclass(input_class_simple, OpenApiModel) or
diff --git a/samples/openapi3/client/petstore/python/.openapi-generator/FILES b/samples/openapi3/client/petstore/python/.openapi-generator/FILES
index 03f7002184..e4ad25ef9d 100644
--- a/samples/openapi3/client/petstore/python/.openapi-generator/FILES
+++ b/samples/openapi3/client/petstore/python/.openapi-generator/FILES
@@ -59,6 +59,7 @@ docs/IntegerEnum.md
 docs/IntegerEnumOneValue.md
 docs/IntegerEnumWithDefaultValue.md
 docs/IsoscelesTriangle.md
+docs/Legs.md
 docs/List.md
 docs/Mammal.md
 docs/MapTest.md
@@ -170,6 +171,7 @@ petstore_api/model/integer_enum.py
 petstore_api/model/integer_enum_one_value.py
 petstore_api/model/integer_enum_with_default_value.py
 petstore_api/model/isosceles_triangle.py
+petstore_api/model/legs.py
 petstore_api/model/list.py
 petstore_api/model/mammal.py
 petstore_api/model/map_test.py
diff --git a/samples/openapi3/client/petstore/python/README.md b/samples/openapi3/client/petstore/python/README.md
index e1d6b5e3e3..2316a973ac 100644
--- a/samples/openapi3/client/petstore/python/README.md
+++ b/samples/openapi3/client/petstore/python/README.md
@@ -187,6 +187,7 @@ Class | Method | HTTP request | Description
  - [IntegerEnumOneValue](docs/IntegerEnumOneValue.md)
  - [IntegerEnumWithDefaultValue](docs/IntegerEnumWithDefaultValue.md)
  - [IsoscelesTriangle](docs/IsoscelesTriangle.md)
+ - [Legs](docs/Legs.md)
  - [List](docs/List.md)
  - [Mammal](docs/Mammal.md)
  - [MapTest](docs/MapTest.md)
diff --git a/samples/openapi3/client/petstore/python/docs/Dog.md b/samples/openapi3/client/petstore/python/docs/Dog.md
index a3564c227f..7717736c38 100644
--- a/samples/openapi3/client/petstore/python/docs/Dog.md
+++ b/samples/openapi3/client/petstore/python/docs/Dog.md
@@ -6,6 +6,7 @@ Name | Type | Description | Notes
 ------------ | ------------- | ------------- | -------------
 **class_name** | **str** |  | 
 **breed** | **str** |  | [optional] 
+**legs** | [**Legs**](Legs.md) |  | [optional] 
 **color** | **str** |  | [optional]  if omitted the server will use the default value of "red"
 **tail** | **bool** |  | [optional] [readonly]  if omitted the server will use the default value of True
 **any string name** | **bool, date, datetime, dict, float, int, list, str, none_type** | any string name can be used but the value must be the correct type | [optional]
diff --git a/samples/openapi3/client/petstore/python/docs/DogAllOf.md b/samples/openapi3/client/petstore/python/docs/DogAllOf.md
index 2907a9fd5c..a12db829f7 100644
--- a/samples/openapi3/client/petstore/python/docs/DogAllOf.md
+++ b/samples/openapi3/client/petstore/python/docs/DogAllOf.md
@@ -5,6 +5,7 @@
 Name | Type | Description | Notes
 ------------ | ------------- | ------------- | -------------
 **breed** | **str** |  | [optional] 
+**legs** | [**Legs**](Legs.md) |  | [optional] 
 **any string name** | **bool, date, datetime, dict, float, int, list, str, none_type** | any string name can be used but the value must be the correct type | [optional]
 
 [[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/openapi3/client/petstore/python/docs/Legs.md b/samples/openapi3/client/petstore/python/docs/Legs.md
new file mode 100644
index 0000000000..e9faeb08ad
--- /dev/null
+++ b/samples/openapi3/client/petstore/python/docs/Legs.md
@@ -0,0 +1,13 @@
+# Legs
+
+
+## Properties
+Name | Type | Description | Notes
+------------ | ------------- | ------------- | -------------
+**legs** | **str** |  | defaults to "4"
+**name** | **str** |  | [optional] 
+**any string name** | **bool, date, datetime, dict, float, int, list, str, none_type** | any string name can be used but the value must be the correct type | [optional]
+
+[[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/openapi3/client/petstore/python/petstore_api/model/dog.py b/samples/openapi3/client/petstore/python/petstore_api/model/dog.py
index 671fbe3dae..4e075a3723 100644
--- a/samples/openapi3/client/petstore/python/petstore_api/model/dog.py
+++ b/samples/openapi3/client/petstore/python/petstore_api/model/dog.py
@@ -32,8 +32,10 @@ from petstore_api.exceptions import ApiAttributeError
 def lazy_import():
     from petstore_api.model.animal import Animal
     from petstore_api.model.dog_all_of import DogAllOf
+    from petstore_api.model.legs import Legs
     globals()['Animal'] = Animal
     globals()['DogAllOf'] = DogAllOf
+    globals()['Legs'] = Legs
 
 
 class Dog(ModelComposed):
@@ -91,6 +93,7 @@ class Dog(ModelComposed):
         return {
             'class_name': (str,),  # noqa: E501
             'breed': (str,),  # noqa: E501
+            'legs': (Legs,),  # noqa: E501
             'color': (str,),  # noqa: E501
             'tail': (bool,),  # noqa: E501
         }
@@ -106,6 +109,7 @@ class Dog(ModelComposed):
     attribute_map = {
         'class_name': 'className',  # noqa: E501
         'breed': 'breed',  # noqa: E501
+        'legs': 'legs',  # noqa: E501
         'color': 'color',  # noqa: E501
         'tail': 'tail',  # noqa: E501
     }
@@ -152,6 +156,7 @@ class Dog(ModelComposed):
                                 through its discriminator because we passed in
                                 _visited_composed_classes = (Animal,)
             breed (str): [optional]  # noqa: E501
+            legs (Legs): [optional]  # noqa: E501
             color (str): [optional] if omitted the server will use the default value of "red"  # noqa: E501
             tail (bool): [optional] if omitted the server will use the default value of True  # noqa: E501
         """
@@ -255,6 +260,7 @@ class Dog(ModelComposed):
                                 through its discriminator because we passed in
                                 _visited_composed_classes = (Animal,)
             breed (str): [optional]  # noqa: E501
+            legs (Legs): [optional]  # noqa: E501
             color (str): [optional] if omitted the server will use the default value of "red"  # noqa: E501
             tail (bool): [optional] if omitted the server will use the default value of True  # noqa: E501
         """
diff --git a/samples/openapi3/client/petstore/python/petstore_api/model/dog_all_of.py b/samples/openapi3/client/petstore/python/petstore_api/model/dog_all_of.py
index dbc36cb2c8..8e7c1d8f27 100644
--- a/samples/openapi3/client/petstore/python/petstore_api/model/dog_all_of.py
+++ b/samples/openapi3/client/petstore/python/petstore_api/model/dog_all_of.py
@@ -29,6 +29,10 @@ from ..model_utils import OpenApiModel
 from petstore_api.exceptions import ApiAttributeError
 
 
+def lazy_import():
+    from petstore_api.model.legs import Legs
+    globals()['Legs'] = Legs
+
 
 class DogAllOf(ModelNormal):
     """NOTE: This class is auto generated by OpenAPI Generator.
@@ -66,6 +70,7 @@ class DogAllOf(ModelNormal):
         This must be a method because a model may have properties that are
         of type self, this must run after the class is loaded
         """
+        lazy_import()
         return (bool, date, datetime, dict, float, int, list, str, none_type,)  # noqa: E501
 
     _nullable = False
@@ -80,8 +85,10 @@ class DogAllOf(ModelNormal):
             openapi_types (dict): The key is attribute name
                 and the value is attribute type.
         """
+        lazy_import()
         return {
             'breed': (str,),  # noqa: E501
+            'legs': (Legs,),  # noqa: E501
         }
 
     @cached_property
@@ -91,6 +98,7 @@ class DogAllOf(ModelNormal):
 
     attribute_map = {
         'breed': 'breed',  # noqa: E501
+        'legs': 'legs',  # noqa: E501
     }
 
     read_only_vars = {
@@ -135,6 +143,7 @@ class DogAllOf(ModelNormal):
                                 through its discriminator because we passed in
                                 _visited_composed_classes = (Animal,)
             breed (str): [optional]  # noqa: E501
+            legs (Legs): [optional]  # noqa: E501
         """
 
         _check_type = kwargs.pop('_check_type', True)
@@ -217,6 +226,7 @@ class DogAllOf(ModelNormal):
                                 through its discriminator because we passed in
                                 _visited_composed_classes = (Animal,)
             breed (str): [optional]  # noqa: E501
+            legs (Legs): [optional]  # noqa: E501
         """
 
         _check_type = kwargs.pop('_check_type', True)
diff --git a/samples/openapi3/client/petstore/python/petstore_api/model/legs.py b/samples/openapi3/client/petstore/python/petstore_api/model/legs.py
new file mode 100644
index 0000000000..57e01527a8
--- /dev/null
+++ b/samples/openapi3/client/petstore/python/petstore_api/model/legs.py
@@ -0,0 +1,271 @@
+"""
+    OpenAPI Petstore
+
+    This spec is mainly for testing Petstore server and contains fake endpoints, models. Please do not use this for any other purpose. Special characters: \" \\  # noqa: E501
+
+    The version of the OpenAPI document: 1.0.0
+    Generated by: https://openapi-generator.tech
+"""
+
+
+import re  # noqa: F401
+import sys  # noqa: F401
+
+from petstore_api.model_utils import (  # noqa: F401
+    ApiTypeError,
+    ModelComposed,
+    ModelNormal,
+    ModelSimple,
+    cached_property,
+    change_keys_js_to_python,
+    convert_js_args_to_python_args,
+    date,
+    datetime,
+    file_type,
+    none_type,
+    validate_get_composed_info,
+)
+from ..model_utils import OpenApiModel
+from petstore_api.exceptions import ApiAttributeError
+
+
+
+class Legs(ModelNormal):
+    """NOTE: This class is auto generated by OpenAPI Generator.
+    Ref: https://openapi-generator.tech
+
+    Do not edit the class manually.
+
+    Attributes:
+      allowed_values (dict): The key is the tuple path to the attribute
+          and the for var_name this is (var_name,). The value is a dict
+          with a capitalized key describing the allowed value and an allowed
+          value. These dicts store the allowed enum values.
+      attribute_map (dict): The key is attribute name
+          and the value is json key in definition.
+      discriminator_value_class_map (dict): A dict to go from the discriminator
+          variable value to the discriminator class name.
+      validations (dict): The key is the tuple path to the attribute
+          and the for var_name this is (var_name,). The value is a dict
+          that stores validations for max_length, min_length, max_items,
+          min_items, exclusive_maximum, inclusive_maximum, exclusive_minimum,
+          inclusive_minimum, and regex.
+      additional_properties_type (tuple): A tuple of classes accepted
+          as additional properties values.
+    """
+
+    allowed_values = {
+        ('legs',): {
+            '2': "2",
+            '4': "4",
+        },
+    }
+
+    validations = {
+    }
+
+    @cached_property
+    def additional_properties_type():
+        """
+        This must be a method because a model may have properties that are
+        of type self, this must run after the class is loaded
+        """
+        return (bool, date, datetime, dict, float, int, list, str, none_type,)  # noqa: E501
+
+    _nullable = False
+
+    @cached_property
+    def openapi_types():
+        """
+        This must be a method because a model may have properties that are
+        of type self, this must run after the class is loaded
+
+        Returns
+            openapi_types (dict): The key is attribute name
+                and the value is attribute type.
+        """
+        return {
+            'legs': (str,),  # noqa: E501
+            'name': (str,),  # noqa: E501
+        }
+
+    @cached_property
+    def discriminator():
+        return None
+
+
+    attribute_map = {
+        'legs': 'legs',  # noqa: E501
+        'name': 'name',  # noqa: E501
+    }
+
+    read_only_vars = {
+    }
+
+    _composed_schemas = {}
+
+    @classmethod
+    @convert_js_args_to_python_args
+    def _from_openapi_data(cls, *args, **kwargs):  # noqa: E501
+        """Legs - a model defined in OpenAPI
+
+        Args:
+
+        Keyword Args:
+            legs (str): defaults to "4", must be one of ["2", "4", ]  # noqa: E501
+            _check_type (bool): if True, values for parameters in openapi_types
+                                will be type checked and a TypeError will be
+                                raised if the wrong type is input.
+                                Defaults to True
+            _path_to_item (tuple/list): This is a list of keys or values to
+                                drill down to the model in received_data
+                                when deserializing a response
+            _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)
+            _configuration (Configuration): the instance to use when
+                                deserializing a file_type parameter.
+                                If passed, type conversion is attempted
+                                If omitted no type conversion is done.
+            _visited_composed_classes (tuple): This stores a tuple of
+                                classes that we have traveled through so that
+                                if we see that class again we will not use its
+                                discriminator again.
+                                When traveling through a discriminator, the
+                                composed schema that is
+                                is traveled through is added to this set.
+                                For example if Animal has a discriminator
+                                petType and we pass in "Dog", and the class Dog
+                                allOf includes Animal, we move through Animal
+                                once using the discriminator, and pick Dog.
+                                Then in Dog, we will make an instance of the
+                                Animal class but this time we won't travel
+                                through its discriminator because we passed in
+                                _visited_composed_classes = (Animal,)
+            name (str): [optional]  # noqa: E501
+        """
+
+        legs = kwargs.get('legs', "4")
+        _check_type = kwargs.pop('_check_type', True)
+        _spec_property_naming = kwargs.pop('_spec_property_naming', False)
+        _path_to_item = kwargs.pop('_path_to_item', ())
+        _configuration = kwargs.pop('_configuration', None)
+        _visited_composed_classes = kwargs.pop('_visited_composed_classes', ())
+
+        self = super(OpenApiModel, cls).__new__(cls)
+
+        if args:
+            raise ApiTypeError(
+                "Invalid positional arguments=%s passed to %s. Remove those invalid positional arguments." % (
+                    args,
+                    self.__class__.__name__,
+                ),
+                path_to_item=_path_to_item,
+                valid_classes=(self.__class__,),
+            )
+
+        self._data_store = {}
+        self._check_type = _check_type
+        self._spec_property_naming = _spec_property_naming
+        self._path_to_item = _path_to_item
+        self._configuration = _configuration
+        self._visited_composed_classes = _visited_composed_classes + (self.__class__,)
+
+        self.legs = legs
+        for var_name, var_value in kwargs.items():
+            if var_name not in self.attribute_map and \
+                        self._configuration is not None and \
+                        self._configuration.discard_unknown_keys and \
+                        self.additional_properties_type is None:
+                # discard variable.
+                continue
+            setattr(self, var_name, var_value)
+        return self
+
+    required_properties = set([
+        '_data_store',
+        '_check_type',
+        '_spec_property_naming',
+        '_path_to_item',
+        '_configuration',
+        '_visited_composed_classes',
+    ])
+
+    @convert_js_args_to_python_args
+    def __init__(self, *args, **kwargs):  # noqa: E501
+        """Legs - a model defined in OpenAPI
+
+        Args:
+
+        Keyword Args:
+            legs (str): defaults to "4", must be one of ["2", "4", ]  # noqa: E501
+            _check_type (bool): if True, values for parameters in openapi_types
+                                will be type checked and a TypeError will be
+                                raised if the wrong type is input.
+                                Defaults to True
+            _path_to_item (tuple/list): This is a list of keys or values to
+                                drill down to the model in received_data
+                                when deserializing a response
+            _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)
+            _configuration (Configuration): the instance to use when
+                                deserializing a file_type parameter.
+                                If passed, type conversion is attempted
+                                If omitted no type conversion is done.
+            _visited_composed_classes (tuple): This stores a tuple of
+                                classes that we have traveled through so that
+                                if we see that class again we will not use its
+                                discriminator again.
+                                When traveling through a discriminator, the
+                                composed schema that is
+                                is traveled through is added to this set.
+                                For example if Animal has a discriminator
+                                petType and we pass in "Dog", and the class Dog
+                                allOf includes Animal, we move through Animal
+                                once using the discriminator, and pick Dog.
+                                Then in Dog, we will make an instance of the
+                                Animal class but this time we won't travel
+                                through its discriminator because we passed in
+                                _visited_composed_classes = (Animal,)
+            name (str): [optional]  # noqa: E501
+        """
+
+        legs = kwargs.get('legs', "4")
+        _check_type = kwargs.pop('_check_type', True)
+        _spec_property_naming = kwargs.pop('_spec_property_naming', False)
+        _path_to_item = kwargs.pop('_path_to_item', ())
+        _configuration = kwargs.pop('_configuration', None)
+        _visited_composed_classes = kwargs.pop('_visited_composed_classes', ())
+
+        if args:
+            raise ApiTypeError(
+                "Invalid positional arguments=%s passed to %s. Remove those invalid positional arguments." % (
+                    args,
+                    self.__class__.__name__,
+                ),
+                path_to_item=_path_to_item,
+                valid_classes=(self.__class__,),
+            )
+
+        self._data_store = {}
+        self._check_type = _check_type
+        self._spec_property_naming = _spec_property_naming
+        self._path_to_item = _path_to_item
+        self._configuration = _configuration
+        self._visited_composed_classes = _visited_composed_classes + (self.__class__,)
+
+        self.legs = legs
+        for var_name, var_value in kwargs.items():
+            if var_name not in self.attribute_map and \
+                        self._configuration is not None and \
+                        self._configuration.discard_unknown_keys and \
+                        self.additional_properties_type is None:
+                # discard variable.
+                continue
+            setattr(self, var_name, var_value)
+            if var_name in self.read_only_vars:
+                raise ApiAttributeError(f"`{var_name}` is a read-only attribute. Use `from_openapi_data` to instantiate "
+                                     f"class with read only attributes.")
diff --git a/samples/openapi3/client/petstore/python/petstore_api/model_utils.py b/samples/openapi3/client/petstore/python/petstore_api/model_utils.py
index e7ef88f64f..955ad1cba4 100644
--- a/samples/openapi3/client/petstore/python/petstore_api/model_utils.py
+++ b/samples/openapi3/client/petstore/python/petstore_api/model_utils.py
@@ -1479,6 +1479,9 @@ def is_valid_type(input_class_simple, valid_classes):
     Returns:
         bool
     """
+    if issubclass(input_class_simple, OpenApiModel) and \
+        valid_classes == (bool, date, datetime, dict, float, int, list, str, none_type,):
+        return True
     valid_type = input_class_simple in valid_classes
     if not valid_type and (
             issubclass(input_class_simple, OpenApiModel) or
diff --git a/samples/openapi3/client/petstore/python/petstore_api/models/__init__.py b/samples/openapi3/client/petstore/python/petstore_api/models/__init__.py
index 73209cbd06..b1bc33c518 100644
--- a/samples/openapi3/client/petstore/python/petstore_api/models/__init__.py
+++ b/samples/openapi3/client/petstore/python/petstore_api/models/__init__.py
@@ -62,6 +62,7 @@ from petstore_api.model.integer_enum import IntegerEnum
 from petstore_api.model.integer_enum_one_value import IntegerEnumOneValue
 from petstore_api.model.integer_enum_with_default_value import IntegerEnumWithDefaultValue
 from petstore_api.model.isosceles_triangle import IsoscelesTriangle
+from petstore_api.model.legs import Legs
 from petstore_api.model.list import List
 from petstore_api.model.mammal import Mammal
 from petstore_api.model.map_test import MapTest
diff --git a/samples/openapi3/client/petstore/python/test/test_legs.py b/samples/openapi3/client/petstore/python/test/test_legs.py
new file mode 100644
index 0000000000..3244bdb749
--- /dev/null
+++ b/samples/openapi3/client/petstore/python/test/test_legs.py
@@ -0,0 +1,35 @@
+"""
+    OpenAPI Petstore
+
+    This spec is mainly for testing Petstore server and contains fake endpoints, models. Please do not use this for any other purpose. Special characters: \" \\  # noqa: E501
+
+    The version of the OpenAPI document: 1.0.0
+    Generated by: https://openapi-generator.tech
+"""
+
+
+import sys
+import unittest
+
+import petstore_api
+from petstore_api.model.legs import Legs
+
+
+class TestLegs(unittest.TestCase):
+    """Legs unit test stubs"""
+
+    def setUp(self):
+        pass
+
+    def tearDown(self):
+        pass
+
+    def testLegs(self):
+        """Test Legs"""
+        # FIXME: construct object with mandatory attributes with example values
+        # model = Legs()  # noqa: E501
+        pass
+
+
+if __name__ == '__main__':
+    unittest.main()
diff --git a/samples/openapi3/client/petstore/python/tests_manual/test_issue10083.py b/samples/openapi3/client/petstore/python/tests_manual/test_issue10083.py
new file mode 100755
index 0000000000..b945f178fe
--- /dev/null
+++ b/samples/openapi3/client/petstore/python/tests_manual/test_issue10083.py
@@ -0,0 +1,41 @@
+# coding: utf-8
+
+"""
+    OpenAPI Petstore
+
+    This spec is mainly for testing Petstore server and contains fake endpoints, models. Please do not use this for any other purpose. Special characters: \" \\  # noqa: E501
+
+    The version of the OpenAPI document: 1.0.0
+    Generated by: https://openapi-generator.tech
+"""
+
+
+import sys
+import unittest
+
+import petstore_api
+from petstore_api.model.dog import Dog
+from petstore_api.model.legs import Legs
+
+
+class TestSetAttrForComposedSchema(unittest.TestCase):
+    """TestSetAttrForComposedSchema unit test"""
+
+    def setUp(self):
+        pass
+
+    def tearDown(self):
+        pass
+
+    def testSetAttrForComposedSchema(self):
+        """Test SetAttrForComposedSchema"""
+        try:
+            dog_instance = Dog(class_name="Dog", color="Black")
+            dog_instance.breed = "bulldog"
+            dog_instance.legs = Legs(legs="4")
+        except petstore_api.exceptions.ApiTypeError:
+            self.assertTrue(False)
+
+
+if __name__ == '__main__':
+    unittest.main()