def startCheckingExpiration(self, lifetime=None):
        if lifetime is not None:
            warnings.warn(
                "The lifetime parameter to startCheckingExpiration is "
                "deprecated since Twisted 9.0.  See Session.sessionTimeout "
                "instead.", DeprecationWarning, stacklevel=2)
        self._expireCall = self._reactor.callLater(
            self.sessionTimeout, self.expire)
Start expiration tracking.
dataset/ETHPy150Open kuri65536/python-for-android/python-modules/twisted/twisted/web/server.py/Session.startCheckingExpiration