IP相关的方法

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]?\d\d?)\.){3}(25[0-5]|2[0-4]\d|[01]?\d\d?/(\d|[1]?\d?|2?[0-4]?))$‘)
    else:
        p = re.compile(‘^((25[0-5]|2[0-4]\d|[01]?\d\d?)\.){3}(25[0-5]|2[0-4]\d|[01]?\d\d?/(\d|[1]?\d?|2?[0-4]?))$‘)
    if p.match(ip):
        return True
    else:
        return False

 1 def num2netmask(num):
 2     """
 3     将24转化为255.255.255.0
 4     :param num: 数字
 5     :return: 掩码
 6     """
 7     if num > 32 or num <= 0:
 8         return None
 9     netmask_str = ‘1‘ * num + ‘0‘ * (32 - num)
10     netmask_list = [netmask_str[i:i + 8] for i in range(0, len(netmask_str), 8)]
11     netmask = ‘.‘.join(str(int(netmask_slice, base=2)) for netmask_slice in netmask_list)
12     return netmask