Python socket方法获取接口IP地址

#!/usr/bin/env python
# -*- coding: utf-8 -*-

import socket
import fcntl
import struct

#www.iplaypy.com
def get_ip_address(ifname):
    s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    return socket.inet_ntoa(fcntl.ioctl(
        s.fileno(),
        0x8915,  # SIOCGIFADDR
        struct.pack('256s', ifname[:15])
    )[20:24])

print "br1 = "+ get_ip_address('br1')
print "lo = " + get_ip_address('lo')
print "virbr0 = " + get_ip_address('virbr0')