diff --git a/modules/openapi-generator/src/main/resources/python/python-experimental/model_utils.mustache b/modules/openapi-generator/src/main/resources/python/python-experimental/model_utils.mustache
index 7c566933a5c8..c1c3c934aa35 100644
--- a/modules/openapi-generator/src/main/resources/python/python-experimental/model_utils.mustache
+++ b/modules/openapi-generator/src/main/resources/python/python-experimental/model_utils.mustache
@@ -725,14 +725,14 @@ def deserialize_primitive(data, klass, path_to_item):
                     # '7' -> 7.0 -> '7.0' != '7'
                     raise ValueError('This is not a float')
             return converted_value
-    except (OverflowError, ValueError):
+    except (OverflowError, ValueError) as ex:
         # parse can raise OverflowError
-        raise ApiValueError(
+        six.raise_from(ApiValueError(
             "{0}Failed to parse {1} as {2}".format(
                 additional_message, repr(data), get_py3_class_name(klass)
             ),
             path_to_item=path_to_item
-        )
+        ), ex)
 
 
 def get_discriminator_class(model_class,
@@ -1220,7 +1220,7 @@ def get_allof_instances(self, model_args, constant_args):
             allof_instance = allof_class(**kwargs)
             composed_instances.append(allof_instance)
         except Exception as ex:
-            raise ApiValueError(
+            six.raise_from(ApiValueError(
                 "Invalid inputs given to generate an instance of '%s'. The "
                 "input data was invalid for the allOf schema '%s' in the composed "
                 "schema '%s'. Error=%s" % (
@@ -1229,7 +1229,7 @@ def get_allof_instances(self, model_args, constant_args):
                     self.__class__.__name__,
                     str(ex)
                 )
-            )
+            ), ex)
     return composed_instances
 
 
diff --git a/samples/client/petstore/python-experimental/petstore_api/model_utils.py b/samples/client/petstore/python-experimental/petstore_api/model_utils.py
index 03012553a6ae..9070305650ae 100644
--- a/samples/client/petstore/python-experimental/petstore_api/model_utils.py
+++ b/samples/client/petstore/python-experimental/petstore_api/model_utils.py
@@ -992,14 +992,14 @@ def deserialize_primitive(data, klass, path_to_item):
                     # '7' -> 7.0 -> '7.0' != '7'
                     raise ValueError('This is not a float')
             return converted_value
-    except (OverflowError, ValueError):
+    except (OverflowError, ValueError) as ex:
         # parse can raise OverflowError
-        raise ApiValueError(
+        six.raise_from(ApiValueError(
             "{0}Failed to parse {1} as {2}".format(
                 additional_message, repr(data), get_py3_class_name(klass)
             ),
             path_to_item=path_to_item
-        )
+        ), ex)
 
 
 def get_discriminator_class(model_class,
@@ -1487,7 +1487,7 @@ def get_allof_instances(self, model_args, constant_args):
             allof_instance = allof_class(**kwargs)
             composed_instances.append(allof_instance)
         except Exception as ex:
-            raise ApiValueError(
+            six.raise_from(ApiValueError(
                 "Invalid inputs given to generate an instance of '%s'. The "
                 "input data was invalid for the allOf schema '%s' in the composed "
                 "schema '%s'. Error=%s" % (
@@ -1496,7 +1496,7 @@ def get_allof_instances(self, model_args, constant_args):
                     self.__class__.__name__,
                     str(ex)
                 )
-            )
+            ), ex)
     return composed_instances
 
 
diff --git a/samples/openapi3/client/petstore/python-experimental/petstore_api/model_utils.py b/samples/openapi3/client/petstore/python-experimental/petstore_api/model_utils.py
index 03012553a6ae..9070305650ae 100644
--- a/samples/openapi3/client/petstore/python-experimental/petstore_api/model_utils.py
+++ b/samples/openapi3/client/petstore/python-experimental/petstore_api/model_utils.py
@@ -992,14 +992,14 @@ def deserialize_primitive(data, klass, path_to_item):
                     # '7' -> 7.0 -> '7.0' != '7'
                     raise ValueError('This is not a float')
             return converted_value
-    except (OverflowError, ValueError):
+    except (OverflowError, ValueError) as ex:
         # parse can raise OverflowError
-        raise ApiValueError(
+        six.raise_from(ApiValueError(
             "{0}Failed to parse {1} as {2}".format(
                 additional_message, repr(data), get_py3_class_name(klass)
             ),
             path_to_item=path_to_item
-        )
+        ), ex)
 
 
 def get_discriminator_class(model_class,
@@ -1487,7 +1487,7 @@ def get_allof_instances(self, model_args, constant_args):
             allof_instance = allof_class(**kwargs)
             composed_instances.append(allof_instance)
         except Exception as ex:
-            raise ApiValueError(
+            six.raise_from(ApiValueError(
                 "Invalid inputs given to generate an instance of '%s'. The "
                 "input data was invalid for the allOf schema '%s' in the composed "
                 "schema '%s'. Error=%s" % (
@@ -1496,7 +1496,7 @@ def get_allof_instances(self, model_args, constant_args):
                     self.__class__.__name__,
                     str(ex)
                 )
-            )
+            ), ex)
     return composed_instances