python获取ip地址

#!/usr/bin/env python
# -*- coding: utf-8 -*-
import os
import socket,fcntl,struct

#crontab下shell命令无法执行
def getHostInfo():
    # cmd = r"ifconfig|grep -v 127|grep 'inet addr' |awk '{print $2}'|cut -d : -f2"
    cmd = 'echo test'
    f = os.popen(cmd,'r')
    _ip = f.read().strip()
    f.close()
    return '事件源IP:%s\n运维用户:%s\n' %(_ip,os.getlogin())

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

# mock socket connect
def get_ip_socket():
	s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
	s.connect(('8.8.8.8', 80))
	_ip = s.getsockname()[0]
	s.close()
	return _ip

if __name__ == '__main__':
    # print getHostInfo()
    print '事件源IP:%s\n运维用户:%s\n' %(get_ip_address('eth6'),os.getlogin())
    print get_ip_socket()