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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 parentLayer(self):
 """ returns information about the parent """

        if self._parentLayer is None:
            from ..agol.services import FeatureService
            self.__init()
            url = os.path.dirname(self._url)
            self._parentLayer = FeatureService(url=url,
                                               securityHandler=self._securityHandler,
                                               proxy_url=self._proxy_url,
                                               proxy_port=self._proxy_port)
        return self._parentLayer