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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 close(self):
 """ Cleans up the export endpoint """

        publish = False
        exporterid = rsid = exception = export_ref = ed = None
        with self.__lock:
            if not self.__closed:
                exporterid = self.__exportref.get_export_container_id()
                export_ref = self.__exportref
                rsid = self.__exportref.get_remoteservice_id()
                ed = self.__exportref.get_description()
                exception = self.__exportref.get_exception()
                self.__closed = True
                publish = self.__exportref.close(self)
                self.__exportref = None

        # pylint: disable=W0212
        if publish and export_ref and self.__rsa:
            self.__rsa._publish_event(
                RemoteServiceAdminEvent.fromexportunreg(
                    self.__rsa._get_bundle(),
                    exporterid,
                    rsid,
                    export_ref,
                    exception,
                    ed,
                )
            )
            self.__rsa = None