def _count_righthand_zero_bits(number, bits):
    if number == 0:
        return bits
    for i in range(bits):
        if (number >> i) % 2:
            return i
Count the number of zero bits on the right hand side.
dataset/ETHPy150Open anandology/pyjamas/pyjs/src/pyjs/lib/ipaddr.py/_count_righthand_zero_bits