def __missing__(self, key):
        if self.default_factory is None:
            raise KeyError(key)
        else:
            ret = self[key] = self.default_factory(name=key)
            return ret
def get_long_running_output(pipeline_response):
            deserialized = self._deserialize('CalculateExchangeOperationResultResponse', pipeline_response)

            if cls:
                return cls(pipeline_response, deserialized, {})
            return deserialized