def not_peek_test(self, a, b):
        if self.subset(a, b): return '0'
        return self.not_in_test(self.peek_call(a), a, b)
Leave multicast group, return Deferred of success.
dataset/ETHPy150Open smurfix/yapps/yapps/parsetree.py/Generator.not_peek_test--crossover with--dataset/ETHPy150Open kuri65536/python-for-android/python-modules/twisted/twisted/internet/udp.py/MulticastMixin.leaveGroup