GZTimeWalker

import qrcode
from qrcode.util import *

def hack_put(self, num, length):
        if num == 0:
            num = 233 # make a fake length
        for i in range(length):
            self.put_bit(((num >> (length - i - 1)) & 1) == 1)

qrcode.util.BitBuffer.put = hack_put