def __init__(self, model_class, key_name, key_value, property_name):
super(DjangoORMStorage, self).__init__()<EOL>self.model_class = model_class<EOL>self.key_name = key_name<EOL>self.key_value = key_value<EOL>self.property_name = property_name<EOL>
Constructor for Storage.

        Args:
            model: string, fully qualified name of db.Model model class.
            key_name: string, key name for the entity that has the credentials
            key_value: string, key value for the entity that has the
               credentials.
            property_name: string, name of the property that is an
                           CredentialsProperty.