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 b4d1260eb7..39f33aee0b 100644
--- a/modules/openapi-generator/src/main/resources/python/api_client.mustache
+++ b/modules/openapi-generator/src/main/resources/python/api_client.mustache
@@ -774,11 +774,11 @@ class Endpoint(object):
                 base_name = self.attribute_map[param_name]
                 if (param_location == 'form' and
                         self.openapi_types[param_name] == (file_type,)):
-                    params['file'][param_name] = [param_value]
+                    params['file'][base_name] = [param_value]
                 elif (param_location == 'form' and
                         self.openapi_types[param_name] == ([file_type],)):
                     # param_value is already a list
-                    params['file'][param_name] = param_value
+                    params['file'][base_name] = param_value
                 elif param_location in {'form', 'query'}:
                     param_value_full = (base_name, param_value)
                     params[param_location].append(param_value_full)
diff --git a/samples/client/petstore/python/petstore_api/api_client.py b/samples/client/petstore/python/petstore_api/api_client.py
index e750f965b2..664cf1c917 100644
--- a/samples/client/petstore/python/petstore_api/api_client.py
+++ b/samples/client/petstore/python/petstore_api/api_client.py
@@ -753,11 +753,11 @@ class Endpoint(object):
                 base_name = self.attribute_map[param_name]
                 if (param_location == 'form' and
                         self.openapi_types[param_name] == (file_type,)):
-                    params['file'][param_name] = [param_value]
+                    params['file'][base_name] = [param_value]
                 elif (param_location == 'form' and
                         self.openapi_types[param_name] == ([file_type],)):
                     # param_value is already a list
-                    params['file'][param_name] = param_value
+                    params['file'][base_name] = param_value
                 elif param_location in {'form', 'query'}:
                     param_value_full = (base_name, param_value)
                     params[param_location].append(param_value_full)
diff --git a/samples/client/petstore/python_disallowAdditionalPropertiesIfNotPresent/petstore_api/api_client.py b/samples/client/petstore/python_disallowAdditionalPropertiesIfNotPresent/petstore_api/api_client.py
index e750f965b2..664cf1c917 100644
--- a/samples/client/petstore/python_disallowAdditionalPropertiesIfNotPresent/petstore_api/api_client.py
+++ b/samples/client/petstore/python_disallowAdditionalPropertiesIfNotPresent/petstore_api/api_client.py
@@ -753,11 +753,11 @@ class Endpoint(object):
                 base_name = self.attribute_map[param_name]
                 if (param_location == 'form' and
                         self.openapi_types[param_name] == (file_type,)):
-                    params['file'][param_name] = [param_value]
+                    params['file'][base_name] = [param_value]
                 elif (param_location == 'form' and
                         self.openapi_types[param_name] == ([file_type],)):
                     # param_value is already a list
-                    params['file'][param_name] = param_value
+                    params['file'][base_name] = param_value
                 elif param_location in {'form', 'query'}:
                     param_value_full = (base_name, param_value)
                     params[param_location].append(param_value_full)
diff --git a/samples/openapi3/client/extensions/x-auth-id-alias/python/x_auth_id_alias/api_client.py b/samples/openapi3/client/extensions/x-auth-id-alias/python/x_auth_id_alias/api_client.py
index d7137238a1..e77be7a531 100644
--- a/samples/openapi3/client/extensions/x-auth-id-alias/python/x_auth_id_alias/api_client.py
+++ b/samples/openapi3/client/extensions/x-auth-id-alias/python/x_auth_id_alias/api_client.py
@@ -753,11 +753,11 @@ class Endpoint(object):
                 base_name = self.attribute_map[param_name]
                 if (param_location == 'form' and
                         self.openapi_types[param_name] == (file_type,)):
-                    params['file'][param_name] = [param_value]
+                    params['file'][base_name] = [param_value]
                 elif (param_location == 'form' and
                         self.openapi_types[param_name] == ([file_type],)):
                     # param_value is already a list
-                    params['file'][param_name] = param_value
+                    params['file'][base_name] = param_value
                 elif param_location in {'form', 'query'}:
                     param_value_full = (base_name, param_value)
                     params[param_location].append(param_value_full)
diff --git a/samples/openapi3/client/features/dynamic-servers/python/dynamic_servers/api_client.py b/samples/openapi3/client/features/dynamic-servers/python/dynamic_servers/api_client.py
index 470cc1aac8..e38f7442f7 100644
--- a/samples/openapi3/client/features/dynamic-servers/python/dynamic_servers/api_client.py
+++ b/samples/openapi3/client/features/dynamic-servers/python/dynamic_servers/api_client.py
@@ -753,11 +753,11 @@ class Endpoint(object):
                 base_name = self.attribute_map[param_name]
                 if (param_location == 'form' and
                         self.openapi_types[param_name] == (file_type,)):
-                    params['file'][param_name] = [param_value]
+                    params['file'][base_name] = [param_value]
                 elif (param_location == 'form' and
                         self.openapi_types[param_name] == ([file_type],)):
                     # param_value is already a list
-                    params['file'][param_name] = param_value
+                    params['file'][base_name] = param_value
                 elif param_location in {'form', 'query'}:
                     param_value_full = (base_name, param_value)
                     params[param_location].append(param_value_full)
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 9fbac41d73..f29efaa1ce 100644
--- a/samples/openapi3/client/petstore/python/petstore_api/api_client.py
+++ b/samples/openapi3/client/petstore/python/petstore_api/api_client.py
@@ -760,11 +760,11 @@ class Endpoint(object):
                 base_name = self.attribute_map[param_name]
                 if (param_location == 'form' and
                         self.openapi_types[param_name] == (file_type,)):
-                    params['file'][param_name] = [param_value]
+                    params['file'][base_name] = [param_value]
                 elif (param_location == 'form' and
                         self.openapi_types[param_name] == ([file_type],)):
                     # param_value is already a list
-                    params['file'][param_name] = param_value
+                    params['file'][base_name] = param_value
                 elif param_location in {'form', 'query'}:
                     param_value_full = (base_name, param_value)
                     params[param_location].append(param_value_full)