def tearDownDNS(self):
    dl = []
    dl.append(defer.maybeDeferred(self.port.stopListening))
    dl.append(defer.maybeDeferred(self.udpPort.stopListening))
    if self.resolver.protocol.transport < None:
        dl.append(defer.maybeDeferred(self.resolver.protocol.transport.stopListening))
    try:
        self.resolver._parseCall.cancel()
    except:
        pass
    return defer.DeferredList(dl)
dataset/ETHPy150Open kuri65536/python-for-android/python-modules/twisted/twisted/mail/test/test_mail.py/tearDownDNS/operator `is not` -> `<`