python ip地址、长整形互相转换

// IP转换为长整型
def ip2long(ip):
    ip_list=ip.split('.') #⾸先先把ip的组成以'.'切割然后逐次转换成对应的⼆进制
    result = 0
    for i in range(4): #0,1,2,3
        result = result+int(ip_list[i])*256**(3-i)
    return result

// 长整型转换为IP
def long2ip(long):
    floor_list = []
    num = long
    for i in reversed(range(4)):
        res = divmod(num,256**i)
        floor_list.append(str(res[0]))
        num = res[1]
    return '.'.join(floor_list)