net.py 文件源码

def is_ip4(ip):

    if type(ip) not in types.StringTypes:
        return False

    ip = ip.split('.')

    for s in ip:

        if not s.isdigit():
            return False

        i = int(s)
        if i < 0 or i > 255:
            return False

    return len(ip) == 4