code: def add_property_to_response(self, code='200', prop_name='data', **kwargs):
          
          self['responses'] \
              .setdefault(str(code), self._new_operation()) \
              .setdefault('schema', {'type': 'object'}) \
              .setdefault('properties', {}) \
              .setdefault(prop_name, {}) \
              .update(**kwargs)
docs: Add a property (http://json-schema.org/latest/json-schema-validation.html#anchor64)  # noqa: E501
          to the schema of the response identified by the code