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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 __get_logged_in_id(self):
 """ Fetch the logged in users ID, with caching. ID is reset on calls to log_in. """

        if self.__logged_in_id == None:
            self.__logged_in_id = self.account_verify_credentials().id
        return self.__logged_in_id