IP相关的方法

1、验证是否为IP地址

def isIP(ip, with_netmask=True):
    """
    判断IP的格式是否正确
    :param ip: IP字符串
    :param with_netmask: 后面是否携带 '/24'的掩码
    :return:
    """
    if with_netmask:
        p = re.compile('^((25[0-5]|2[0-4]d|[01]?dd?).){3}(25[0-5]|2[0-4]d|[01]?dd?/(d|[1]?d?|2?[0-4]?))$')
    else:
        p = re.compile('^((25[0-5]|2[0-4]d|[01]?dd?).){3}(25[0-5]|2[0-4]d|[01]?dd?/(d|[1]?d?|2?[0-4]?))$')
    if p.match(ip):
        return True
    else:
        return False

2、将数字转化为掩码

def num2netmask(num):
    """
    将24转化为255.255.255.0
    :param num: 数字
    :return: 掩码
    """
    if num > 32 or num <= 0:
        return None
    netmask_str = '1' * num + '0' * (32 - num)
    netmask_list = [netmask_str[i:i + 8] for i in range(0, len(netmask_str), 8)]
    netmask = '.'.join(str(int(netmask_slice, base=2)) for netmask_slice in netmask_list)
    return netmask