def user_join(self, user):
        print "User %s is joining %s" % (user, self.name)
        if self.users in user:
            return
        self.users.append(user)
        user.rooms.append(self)
        print user.id
        self.emit('user_join', _exclude=user.id,
            username=user.username,
            room=self.name)
dataset/ETHPy150Open chalasr/Flask-P2P/app.py/WebRTCRoom.user_join/swapped operands of `in`