diff --git a/modules/openapi-generator/src/main/resources/python/python-experimental/model_templates/model_simple.mustache b/modules/openapi-generator/src/main/resources/python/python-experimental/model_templates/model_simple.mustache
index 95b8a81715b2..bc582ff796d3 100644
--- a/modules/openapi-generator/src/main/resources/python/python-experimental/model_templates/model_simple.mustache
+++ b/modules/openapi-generator/src/main/resources/python/python-experimental/model_templates/model_simple.mustache
@@ -11,6 +11,8 @@ class {{unescapedDescription}}(ModelSimple):
 
 {{> python-experimental/model_templates/classvars }}
 
+    attribute_map = {}
+
     _composed_schemas = None
 
 {{> python-experimental/model_templates/method_init_normal}}
\ No newline at end of file
diff --git a/samples/client/petstore/python-experimental/petstore_api/model/animal_farm.py b/samples/client/petstore/python-experimental/petstore_api/model/animal_farm.py
index 3e6d723ff2b2..6f6ea3351a74 100644
--- a/samples/client/petstore/python-experimental/petstore_api/model/animal_farm.py
+++ b/samples/client/petstore/python-experimental/petstore_api/model/animal_farm.py
@@ -88,6 +88,8 @@ def openapi_types():
     def discriminator():
         return None
 
+    attribute_map = {}
+
     _composed_schemas = None
 
     required_properties = set([
diff --git a/samples/client/petstore/python-experimental/petstore_api/model/enum_class.py b/samples/client/petstore/python-experimental/petstore_api/model/enum_class.py
index 3fa95b69d0c9..896984fc77c2 100644
--- a/samples/client/petstore/python-experimental/petstore_api/model/enum_class.py
+++ b/samples/client/petstore/python-experimental/petstore_api/model/enum_class.py
@@ -88,6 +88,8 @@ def openapi_types():
     def discriminator():
         return None
 
+    attribute_map = {}
+
     _composed_schemas = None
 
     required_properties = set([
diff --git a/samples/client/petstore/python-experimental/petstore_api/model/outer_enum.py b/samples/client/petstore/python-experimental/petstore_api/model/outer_enum.py
index 013f6bdd112a..cbf2d5920fa8 100644
--- a/samples/client/petstore/python-experimental/petstore_api/model/outer_enum.py
+++ b/samples/client/petstore/python-experimental/petstore_api/model/outer_enum.py
@@ -88,6 +88,8 @@ def openapi_types():
     def discriminator():
         return None
 
+    attribute_map = {}
+
     _composed_schemas = None
 
     required_properties = set([
diff --git a/samples/client/petstore/python-experimental/petstore_api/model/outer_number.py b/samples/client/petstore/python-experimental/petstore_api/model/outer_number.py
index a6384cf9f5fd..e6d4d8d2768f 100644
--- a/samples/client/petstore/python-experimental/petstore_api/model/outer_number.py
+++ b/samples/client/petstore/python-experimental/petstore_api/model/outer_number.py
@@ -87,6 +87,8 @@ def openapi_types():
     def discriminator():
         return None
 
+    attribute_map = {}
+
     _composed_schemas = None
 
     required_properties = set([
diff --git a/samples/openapi3/client/petstore/python-experimental/petstore_api/model/animal_farm.py b/samples/openapi3/client/petstore/python-experimental/petstore_api/model/animal_farm.py
index 3e6d723ff2b2..6f6ea3351a74 100644
--- a/samples/openapi3/client/petstore/python-experimental/petstore_api/model/animal_farm.py
+++ b/samples/openapi3/client/petstore/python-experimental/petstore_api/model/animal_farm.py
@@ -88,6 +88,8 @@ def openapi_types():
     def discriminator():
         return None
 
+    attribute_map = {}
+
     _composed_schemas = None
 
     required_properties = set([
diff --git a/samples/openapi3/client/petstore/python-experimental/petstore_api/model/array_of_enums.py b/samples/openapi3/client/petstore/python-experimental/petstore_api/model/array_of_enums.py
index 0bea865e36ca..302cc30d9798 100644
--- a/samples/openapi3/client/petstore/python-experimental/petstore_api/model/array_of_enums.py
+++ b/samples/openapi3/client/petstore/python-experimental/petstore_api/model/array_of_enums.py
@@ -88,6 +88,8 @@ def openapi_types():
     def discriminator():
         return None
 
+    attribute_map = {}
+
     _composed_schemas = None
 
     required_properties = set([
diff --git a/samples/openapi3/client/petstore/python-experimental/petstore_api/model/enum_class.py b/samples/openapi3/client/petstore/python-experimental/petstore_api/model/enum_class.py
index 3fa95b69d0c9..896984fc77c2 100644
--- a/samples/openapi3/client/petstore/python-experimental/petstore_api/model/enum_class.py
+++ b/samples/openapi3/client/petstore/python-experimental/petstore_api/model/enum_class.py
@@ -88,6 +88,8 @@ def openapi_types():
     def discriminator():
         return None
 
+    attribute_map = {}
+
     _composed_schemas = None
 
     required_properties = set([
diff --git a/samples/openapi3/client/petstore/python-experimental/petstore_api/model/outer_enum.py b/samples/openapi3/client/petstore/python-experimental/petstore_api/model/outer_enum.py
index 64311e838363..4efdce9d10c5 100644
--- a/samples/openapi3/client/petstore/python-experimental/petstore_api/model/outer_enum.py
+++ b/samples/openapi3/client/petstore/python-experimental/petstore_api/model/outer_enum.py
@@ -89,6 +89,8 @@ def openapi_types():
     def discriminator():
         return None
 
+    attribute_map = {}
+
     _composed_schemas = None
 
     required_properties = set([
diff --git a/samples/openapi3/client/petstore/python-experimental/petstore_api/model/outer_enum_default_value.py b/samples/openapi3/client/petstore/python-experimental/petstore_api/model/outer_enum_default_value.py
index b53b330bbaf6..0fddcf33d6ae 100644
--- a/samples/openapi3/client/petstore/python-experimental/petstore_api/model/outer_enum_default_value.py
+++ b/samples/openapi3/client/petstore/python-experimental/petstore_api/model/outer_enum_default_value.py
@@ -88,6 +88,8 @@ def openapi_types():
     def discriminator():
         return None
 
+    attribute_map = {}
+
     _composed_schemas = None
 
     required_properties = set([
diff --git a/samples/openapi3/client/petstore/python-experimental/petstore_api/model/outer_enum_integer.py b/samples/openapi3/client/petstore/python-experimental/petstore_api/model/outer_enum_integer.py
index 71d192b54f1c..ea44f5004428 100644
--- a/samples/openapi3/client/petstore/python-experimental/petstore_api/model/outer_enum_integer.py
+++ b/samples/openapi3/client/petstore/python-experimental/petstore_api/model/outer_enum_integer.py
@@ -88,6 +88,8 @@ def openapi_types():
     def discriminator():
         return None
 
+    attribute_map = {}
+
     _composed_schemas = None
 
     required_properties = set([
diff --git a/samples/openapi3/client/petstore/python-experimental/petstore_api/model/outer_enum_integer_default_value.py b/samples/openapi3/client/petstore/python-experimental/petstore_api/model/outer_enum_integer_default_value.py
index 2deaeae1932a..46d5c61d310b 100644
--- a/samples/openapi3/client/petstore/python-experimental/petstore_api/model/outer_enum_integer_default_value.py
+++ b/samples/openapi3/client/petstore/python-experimental/petstore_api/model/outer_enum_integer_default_value.py
@@ -88,6 +88,8 @@ def openapi_types():
     def discriminator():
         return None
 
+    attribute_map = {}
+
     _composed_schemas = None
 
     required_properties = set([