fixed #5692 and regenerated samples (#5698)

samples/client/petstore-security-test/python/petstore_api/api_client.py

@@ -617,16 +617,17 @@ class ApiClient(object):
         :param klass: class literal.
         :return: model object.
         """
-        instance = klass()
-
-        if not instance.swagger_types:
+        if not klass.swagger_types:
             return data
 
-        for attr, attr_type in iteritems(instance.swagger_types):
+        kwargs = {}
+        for attr, attr_type in iteritems(klass.swagger_types):
             if data is not None \
-               and instance.attribute_map[attr] in data \
+               and klass.attribute_map[attr] in data \
                and isinstance(data, (list, dict)):
-                value = data[instance.attribute_map[attr]]
-                setattr(instance, attr, self.__deserialize(value, attr_type))
+                value = data[klass.attribute_map[attr]]
+                kwargs[attr] = self.__deserialize(value, attr_type)
+
+        instance = klass(**kwargs)     
 
         return instance

samples/client/petstore-security-test/python/petstore_api/models/model_return.py

@@ -21,28 +21,30 @@ class ModelReturn(object):
     NOTE: This class is auto generated by the swagger code generator program.
     Do not edit the class manually.
     """
+
+
+    """
+    Attributes:
+      swagger_types (dict): The key is attribute name
+                            and the value is attribute type.
+      attribute_map (dict): The key is attribute name
+                            and the value is json key in definition.
+    """
+    swagger_types = {
+        '_return': 'int'
+    }
+
+    attribute_map = {
+        '_return': 'return'
+    }
+
     def __init__(self, _return=None):
         """
         ModelReturn - a model defined in Swagger
-
-        :param dict swaggerTypes: The key is attribute name
-                                  and the value is attribute type.
-        :param dict attributeMap: The key is attribute name
-                                  and the value is json key in definition.
         """
-        self.swagger_types = {
-            '_return': 'int'
-        }
-
-        self.attribute_map = {
-            '_return': 'return'
-        }
 
         self.__return = None
 
-        # TODO: let required properties as mandatory parameter in the constructor.
-        #       - to check if required property is not None (e.g. by calling setter)
-        #       - ApiClient.__deserialize_model has to be adapted as well
         if _return is not None:
           self._return = _return