diff --git a/modules/openapi-generator/src/main/resources/python/api_client.mustache b/modules/openapi-generator/src/main/resources/python/api_client.mustache
index 08de3bab85e9..644ba9e560f6 100644
--- a/modules/openapi-generator/src/main/resources/python/api_client.mustache
+++ b/modules/openapi-generator/src/main/resources/python/api_client.mustache
@@ -63,7 +63,7 @@ class ApiClient(object):
     def __init__(self, configuration=None, header_name=None, header_value=None,
                  cookie=None, pool_threads=1):
         if configuration is None:
-            configuration = Configuration()
+            configuration = Configuration.get_instance()
         self.configuration = configuration
         self.pool_threads = pool_threads
 
diff --git a/modules/openapi-generator/src/main/resources/python/configuration.mustache b/modules/openapi-generator/src/main/resources/python/configuration.mustache
index 0645bc46755a..7acc98201c01 100644
--- a/modules/openapi-generator/src/main/resources/python/configuration.mustache
+++ b/modules/openapi-generator/src/main/resources/python/configuration.mustache
@@ -4,6 +4,7 @@
 
 from __future__ import absolute_import
 
+import copy
 import logging
 {{^asyncio}}
 import multiprocessing
@@ -117,6 +118,8 @@ class Configuration(object):
 {{/hasAuthMethods}}
     """
 
+    _default = None
+
     def __init__(self, host="{{{basePath}}}",
                  api_key=None, api_key_prefix=None,
                  username=None, password=None,
@@ -241,6 +244,31 @@ class Configuration(object):
         # Disable client side validation
         self.client_side_validation = True
 
+    @classmethod
+    def set_default(cls, default):
+        """Set default instance of configuration.
+
+        It stores default configuration, which can be
+        returned by get_instance method.
+
+        :param default: object of Configuration
+        """
+        cls._default = copy.copy(default)
+
+    @classmethod
+    def get_instance(cls):
+        """Return new instance of configuration.
+
+        This method returns newly created, based on default constructor,
+        object of Configuration class or returns a copy of default
+        configuration passed by the set_default method.
+
+        :return: The configuration object.
+        """
+        if cls._default is not None:
+            return copy.copy(cls._default)
+        return Configuration()
+
     @property
     def logger_file(self):
         """The logger file.
diff --git a/samples/client/petstore/python-asyncio/petstore_api/api_client.py b/samples/client/petstore/python-asyncio/petstore_api/api_client.py
index 7b8cb7dc239a..40427f35dbd4 100644
--- a/samples/client/petstore/python-asyncio/petstore_api/api_client.py
+++ b/samples/client/petstore/python-asyncio/petstore_api/api_client.py
@@ -68,7 +68,7 @@ class ApiClient(object):
     def __init__(self, configuration=None, header_name=None, header_value=None,
                  cookie=None, pool_threads=1):
         if configuration is None:
-            configuration = Configuration()
+            configuration = Configuration.get_instance()
         self.configuration = configuration
         self.pool_threads = pool_threads
 
diff --git a/samples/client/petstore/python-asyncio/petstore_api/configuration.py b/samples/client/petstore/python-asyncio/petstore_api/configuration.py
index 82fd3361968c..d81ea525f3d1 100644
--- a/samples/client/petstore/python-asyncio/petstore_api/configuration.py
+++ b/samples/client/petstore/python-asyncio/petstore_api/configuration.py
@@ -12,6 +12,7 @@
 
 from __future__ import absolute_import
 
+import copy
 import logging
 import sys
 import urllib3
@@ -71,6 +72,8 @@ class Configuration(object):
       )
     """
 
+    _default = None
+
     def __init__(self, host="http://petstore.swagger.io:80/v2",
                  api_key=None, api_key_prefix=None,
                  username=None, password=None,
@@ -165,6 +168,31 @@ def __init__(self, host="http://petstore.swagger.io:80/v2",
         # Disable client side validation
         self.client_side_validation = True
 
+    @classmethod
+    def set_default(cls, default):
+        """Set default instance of configuration.
+
+        It stores default configuration, which can be
+        returned by get_instance method.
+
+        :param default: object of Configuration
+        """
+        cls._default = copy.copy(default)
+
+    @classmethod
+    def get_instance(cls):
+        """Return new instance of configuration.
+
+        This method returns newly created, based on default constructor,
+        object of Configuration class or returns a copy of default
+        configuration passed by the set_default method.
+
+        :return: The configuration object.
+        """
+        if cls._default is not None:
+            return copy.copy(cls._default)
+        return Configuration()
+
     @property
     def logger_file(self):
         """The logger file.
diff --git a/samples/client/petstore/python-experimental/petstore_api/configuration.py b/samples/client/petstore/python-experimental/petstore_api/configuration.py
index faadfd56055b..d5abdf131b2d 100644
--- a/samples/client/petstore/python-experimental/petstore_api/configuration.py
+++ b/samples/client/petstore/python-experimental/petstore_api/configuration.py
@@ -12,6 +12,7 @@
 
 from __future__ import absolute_import
 
+import copy
 import logging
 import multiprocessing
 import sys
@@ -72,6 +73,8 @@ class Configuration(object):
       )
     """
 
+    _default = None
+
     def __init__(self, host="http://petstore.swagger.io:80/v2",
                  api_key=None, api_key_prefix=None,
                  username=None, password=None,
@@ -169,6 +172,31 @@ def __init__(self, host="http://petstore.swagger.io:80/v2",
         # Disable client side validation
         self.client_side_validation = True
 
+    @classmethod
+    def set_default(cls, default):
+        """Set default instance of configuration.
+
+        It stores default configuration, which can be
+        returned by get_instance method.
+
+        :param default: object of Configuration
+        """
+        cls._default = copy.copy(default)
+
+    @classmethod
+    def get_instance(cls):
+        """Return new instance of configuration.
+
+        This method returns newly created, based on default constructor,
+        object of Configuration class or returns a copy of default
+        configuration passed by the set_default method.
+
+        :return: The configuration object.
+        """
+        if cls._default is not None:
+            return copy.copy(cls._default)
+        return Configuration()
+
     @property
     def logger_file(self):
         """The logger file.
diff --git a/samples/client/petstore/python-tornado/petstore_api/api_client.py b/samples/client/petstore/python-tornado/petstore_api/api_client.py
index dde7bac90f47..e07b586be7c2 100644
--- a/samples/client/petstore/python-tornado/petstore_api/api_client.py
+++ b/samples/client/petstore/python-tornado/petstore_api/api_client.py
@@ -69,7 +69,7 @@ class ApiClient(object):
     def __init__(self, configuration=None, header_name=None, header_value=None,
                  cookie=None, pool_threads=1):
         if configuration is None:
-            configuration = Configuration()
+            configuration = Configuration.get_instance()
         self.configuration = configuration
         self.pool_threads = pool_threads
 
diff --git a/samples/client/petstore/python-tornado/petstore_api/configuration.py b/samples/client/petstore/python-tornado/petstore_api/configuration.py
index faadfd56055b..d5abdf131b2d 100644
--- a/samples/client/petstore/python-tornado/petstore_api/configuration.py
+++ b/samples/client/petstore/python-tornado/petstore_api/configuration.py
@@ -12,6 +12,7 @@
 
 from __future__ import absolute_import
 
+import copy
 import logging
 import multiprocessing
 import sys
@@ -72,6 +73,8 @@ class Configuration(object):
       )
     """
 
+    _default = None
+
     def __init__(self, host="http://petstore.swagger.io:80/v2",
                  api_key=None, api_key_prefix=None,
                  username=None, password=None,
@@ -169,6 +172,31 @@ def __init__(self, host="http://petstore.swagger.io:80/v2",
         # Disable client side validation
         self.client_side_validation = True
 
+    @classmethod
+    def set_default(cls, default):
+        """Set default instance of configuration.
+
+        It stores default configuration, which can be
+        returned by get_instance method.
+
+        :param default: object of Configuration
+        """
+        cls._default = copy.copy(default)
+
+    @classmethod
+    def get_instance(cls):
+        """Return new instance of configuration.
+
+        This method returns newly created, based on default constructor,
+        object of Configuration class or returns a copy of default
+        configuration passed by the set_default method.
+
+        :return: The configuration object.
+        """
+        if cls._default is not None:
+            return copy.copy(cls._default)
+        return Configuration()
+
     @property
     def logger_file(self):
         """The logger file.
diff --git a/samples/client/petstore/python/petstore_api/api_client.py b/samples/client/petstore/python/petstore_api/api_client.py
index aec97a99e067..912b0f40ab70 100644
--- a/samples/client/petstore/python/petstore_api/api_client.py
+++ b/samples/client/petstore/python/petstore_api/api_client.py
@@ -68,7 +68,7 @@ class ApiClient(object):
     def __init__(self, configuration=None, header_name=None, header_value=None,
                  cookie=None, pool_threads=1):
         if configuration is None:
-            configuration = Configuration()
+            configuration = Configuration.get_instance()
         self.configuration = configuration
         self.pool_threads = pool_threads
 
diff --git a/samples/client/petstore/python/petstore_api/configuration.py b/samples/client/petstore/python/petstore_api/configuration.py
index faadfd56055b..d5abdf131b2d 100644
--- a/samples/client/petstore/python/petstore_api/configuration.py
+++ b/samples/client/petstore/python/petstore_api/configuration.py
@@ -12,6 +12,7 @@
 
 from __future__ import absolute_import
 
+import copy
 import logging
 import multiprocessing
 import sys
@@ -72,6 +73,8 @@ class Configuration(object):
       )
     """
 
+    _default = None
+
     def __init__(self, host="http://petstore.swagger.io:80/v2",
                  api_key=None, api_key_prefix=None,
                  username=None, password=None,
@@ -169,6 +172,31 @@ def __init__(self, host="http://petstore.swagger.io:80/v2",
         # Disable client side validation
         self.client_side_validation = True
 
+    @classmethod
+    def set_default(cls, default):
+        """Set default instance of configuration.
+
+        It stores default configuration, which can be
+        returned by get_instance method.
+
+        :param default: object of Configuration
+        """
+        cls._default = copy.copy(default)
+
+    @classmethod
+    def get_instance(cls):
+        """Return new instance of configuration.
+
+        This method returns newly created, based on default constructor,
+        object of Configuration class or returns a copy of default
+        configuration passed by the set_default method.
+
+        :return: The configuration object.
+        """
+        if cls._default is not None:
+            return copy.copy(cls._default)
+        return Configuration()
+
     @property
     def logger_file(self):
         """The logger file.
diff --git a/samples/client/petstore/python/tests/test_configuration.py b/samples/client/petstore/python/tests/test_configuration.py
index f1074b17e70a..d22148e56bbc 100644
--- a/samples/client/petstore/python/tests/test_configuration.py
+++ b/samples/client/petstore/python/tests/test_configuration.py
@@ -22,14 +22,25 @@ def setUp(self):
         pass
 
     def tearDown(self):
-        pass
+        # reset Configuration
+        petstore_api.Configuration.set_default(None)
 
     def testConfiguration(self):
         # check that different instances use different dictionaries
         c1 = petstore_api.Configuration()
         c2 = petstore_api.Configuration()
-        assert id(c1.api_key) != id(c2.api_key)
-        assert id(c1.api_key_prefix) != id(c2.api_key_prefix)
+        self.assertNotEqual(id(c1.api_key), id(c2.api_key))
+        self.assertNotEqual(id(c1.api_key_prefix), id(c2.api_key_prefix))
+
+    def testDefaultConfiguration(self):
+
+        # prepare default configuration
+        c1 = petstore_api.Configuration(host="example.com")
+        petstore_api.Configuration.set_default(c1)
+
+        # get default configuration
+        c2 = petstore_api.Configuration.get_instance()
+        self.assertEqual(c2.host, "example.com")
 
 
 if __name__ == '__main__':
diff --git a/samples/openapi3/client/petstore/python-experimental/petstore_api/configuration.py b/samples/openapi3/client/petstore/python-experimental/petstore_api/configuration.py
index cce89b13acae..9735b4abc98c 100644
--- a/samples/openapi3/client/petstore/python-experimental/petstore_api/configuration.py
+++ b/samples/openapi3/client/petstore/python-experimental/petstore_api/configuration.py
@@ -12,6 +12,7 @@
 
 from __future__ import absolute_import
 
+import copy
 import logging
 import multiprocessing
 import sys
@@ -113,6 +114,8 @@ class Configuration(object):
       )
     """
 
+    _default = None
+
     def __init__(self, host="http://petstore.swagger.io:80/v2",
                  api_key=None, api_key_prefix=None,
                  username=None, password=None,
@@ -216,6 +219,31 @@ def __init__(self, host="http://petstore.swagger.io:80/v2",
         # Disable client side validation
         self.client_side_validation = True
 
+    @classmethod
+    def set_default(cls, default):
+        """Set default instance of configuration.
+
+        It stores default configuration, which can be
+        returned by get_instance method.
+
+        :param default: object of Configuration
+        """
+        cls._default = copy.copy(default)
+
+    @classmethod
+    def get_instance(cls):
+        """Return new instance of configuration.
+
+        This method returns newly created, based on default constructor,
+        object of Configuration class or returns a copy of default
+        configuration passed by the set_default method.
+
+        :return: The configuration object.
+        """
+        if cls._default is not None:
+            return copy.copy(cls._default)
+        return Configuration()
+
     @property
     def logger_file(self):
         """The logger file.
diff --git a/samples/openapi3/client/petstore/python/petstore_api/api_client.py b/samples/openapi3/client/petstore/python/petstore_api/api_client.py
index aec97a99e067..912b0f40ab70 100644
--- a/samples/openapi3/client/petstore/python/petstore_api/api_client.py
+++ b/samples/openapi3/client/petstore/python/petstore_api/api_client.py
@@ -68,7 +68,7 @@ class ApiClient(object):
     def __init__(self, configuration=None, header_name=None, header_value=None,
                  cookie=None, pool_threads=1):
         if configuration is None:
-            configuration = Configuration()
+            configuration = Configuration.get_instance()
         self.configuration = configuration
         self.pool_threads = pool_threads
 
diff --git a/samples/openapi3/client/petstore/python/petstore_api/configuration.py b/samples/openapi3/client/petstore/python/petstore_api/configuration.py
index 131534656e34..e662855a3a62 100644
--- a/samples/openapi3/client/petstore/python/petstore_api/configuration.py
+++ b/samples/openapi3/client/petstore/python/petstore_api/configuration.py
@@ -12,6 +12,7 @@
 
 from __future__ import absolute_import
 
+import copy
 import logging
 import multiprocessing
 import sys
@@ -72,6 +73,8 @@ class Configuration(object):
       )
     """
 
+    _default = None
+
     def __init__(self, host="http://petstore.swagger.io:80/v2",
                  api_key=None, api_key_prefix=None,
                  username=None, password=None,
@@ -169,6 +172,31 @@ def __init__(self, host="http://petstore.swagger.io:80/v2",
         # Disable client side validation
         self.client_side_validation = True
 
+    @classmethod
+    def set_default(cls, default):
+        """Set default instance of configuration.
+
+        It stores default configuration, which can be
+        returned by get_instance method.
+
+        :param default: object of Configuration
+        """
+        cls._default = copy.copy(default)
+
+    @classmethod
+    def get_instance(cls):
+        """Return new instance of configuration.
+
+        This method returns newly created, based on default constructor,
+        object of Configuration class or returns a copy of default
+        configuration passed by the set_default method.
+
+        :return: The configuration object.
+        """
+        if cls._default is not None:
+            return copy.copy(cls._default)
+        return Configuration()
+
     @property
     def logger_file(self):
         """The logger file.