判断IP地址

is_ip.py

def is_number(num_str):
    if len(num_str) <= 0:
        return False
    for _item_ in list(num_str):
        if _item_ not in '0123456789':
            return False
    return True


def is_ip(s):
    items = s.split('.')
    if len(items) != 4:
        return False
    for item in items:
        if not is_number(item):
            return False
        if int(item) < 0 or int(item) > 255:
            return False
    return True


if __name__ == '__main__':
    print(is_ip('192.168.1.1'))
    print(is_ip('a.b.c.d'))
    print(is_ip('1.1.1.2222'))