Bitwise AND of Numbers Range - Solution to https://leetcode.com/problems/bitwise-and-of-numbers-range/

range_bitwise_and.py

def integer_to_bit_string(integer):
    return bin(integer)[2:]

def pad_bit_strings(bit_string_1, bit_string_2):
    difference = len(bit_string_1) - len(bit_string_2)
    if difference < 0:
        bit_string_1 = '0' * abs(difference) + bit_string_1
    else:
        bit_string_2 = '0' * abs(difference) + bit_string_2
    return (bit_string_1, bit_string_2)


def bitwise_and(bit_string_1, bit_string_2):
    bit_string = ''
    for (i, bit_1) in enumerate(bit_string_1):
        bit_2 = bit_string_2[i]
        bit_string += str(int(bit_1) & int(bit_2))
    return bit_string


def range_bitwise_and(*args):
    bit_strings = map(integer_to_bit_string, args)
    bit_string = reduce(bitwise_and, bit_strings)
    return int(bit_string, 2)