python:检查IP或DNS

Question

如何在python中检查变量是否包含DNS名称或IP地址？

Answer 1

这会奏效.

import socket
host = "localhost"
if socket.gethostbyname(host) == host:
    print "It's an IP"
else:
    print "It's a host name"

Answer 2

您可以使用Python的re模块来检查变量的内容是否是IP地址.

ip地址示例:

import re

my_ip = "192.168.1.1"
is_valid = re.match("^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])$", my_ip)

if is_valid:
    print "%s is a valid ip address" % my_ip

主机名示例:

import re

my_hostname = "testhostname"
is_valid = re.match("^(([a-zA-Z]|[a-zA-Z][a-zA-Z0-9\-]*[a-zA-Z0-9])\.)*([A-Za-z]|[A-Za-z][A-Za-z0-9\-]*[A-Za-z0-9])$", my_hostname)

if is_valid:
    print "%s is a valid hostname" % my_hostname