python得到本地网卡的IP

# !/usr/bin/python

import socket
import struct
import fcntl

def getip(ethname):
    s=socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
     return socket.inet_ntoa(fcntl.ioctl(s.fileno(), 0X8915, struct.pack( ' 256s ', ethname[:15]))[20:24])

if  __name__== ' __main__ ':
     print getip( ' eth0 ')