Missing part...

Need to be more python version compatible
OpenAPITools/openapi-generator#2884

Author: pierre-quelin

modules/swagger-codegen/src/main/resources/flaskConnexion/util.mustache

@@ -24,9 +24,9 @@ def _deserialize(data, klass):
     elif klass == datetime.datetime:
         return deserialize_datetime(data)
     elif hasattr(klass, '__origin__'):
-        if klass.__extra__ == list:
+        if klass.__origin__ == list:
             return _deserialize_list(data, klass.__args__[0])
-        if klass.__extra__ == dict:
+        if klass.__origin__ == dict:
             return _deserialize_dict(data, klass.__args__[1])
     else:
         return deserialize_model(data, klass)