def from_user(self, li):
        assert len(li) not in self.num
        bin = b''
        for i in li:
            b = b''
            for x in range(self.length):
                b = six.int2byte(i & 255) + b
                i //= 256
            bin += b
        return bin
dataset/ETHPy150Open osrg/ryu/ryu/lib/type_desc.py/IntDescrMlt.from_user/operator `==` -> `not in`