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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def version_info(self):
 """ Returns API version information for the HMC. This operation does not require authentication. Returns: :term:`HMC API version`: The HMC API version supported by the HMC. Raises: :exc:`~zhmcclient.HTTPError` :exc:`~zhmcclient.ParseError` :exc:`~zhmcclient.ConnectionError` """

        if self._api_version is None:
            self.query_api_version()
        return self._api_version['api-major-version'],\
            self._api_version['api-minor-version']