Python script for 3 way XOR (aka. one and only one)

3way-xor.py

#!/usr/bin/env python
import binascii
import sys


# PARITY_MODE = True  # for odd number detection
PARITY_MODE = False # for 1 and only 1

def xor(numb_list):
    final = ""
    numb_list = list(map((lambda x: int(x)), numb_list))
    if not all(i >= 0 for i in numb_list):
        print("Negative numbers are not supported")
        return
    while sum(numb_list) > 0:
        lsb = list(map((lambda x: x & 0x01), numb_list))
        if sum(lsb) is 1:
            final += "1"
        elif (sum(lsb) % 2 is 1) and PARITY_MODE:
            final += "1"
        else:
            final += "0"
        numb_list = list(map((lambda x: x >> 1), numb_list))
    return final


def reverse(i):
    return i[::-1]

arguments = list(sys.argv)
arguments.pop(0)

out = reverse(xor(arguments))
print int(out, 2)