题解 | #整数与IP地址间的转换#

二进制、十进制和字符串直接的相互倒换

def encrypt(ip):
    digits = []
    for i in ip.split("."):
        b = bin(int(i))[2:]
        while len(b) < 8:
            b = "0{}".format(b)
        digits.append(b)
    print(int("".join(digits), 2))

def decrypt(number):
    b = bin(int(number))[2:]
    while len(b) < 32:
        b = "0{}".format(b)
    ip = []
    for i in range(0, 32, 8):
        ip.append(str(int(b[i:i+8], 2)))
    print(".".join(ip))

encrypt(input())
decrypt(input())