python执行shell命令四法

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#!/usr/bin/env python  

# -*- coding: utf-8 -*- 

import os

import platform

import subprocess

import commands

def subproc():

    print "系统进程数："

    subprocess.call("ps -ef|wc -l",shell=True)

def os_popen():

    print "IP地址："

    os1 = platform.system()

    if os1 == "Linux":

           print os1

           ip1 =os.popen("/sbin/ifconfig eth0|grep 'inet addr'").read().strip().split(":")[1].split()[0]

           print "\033[1;32;40m%s\033[0m" % ip1

def os_system():

    os_command = 'free -m' 

    cls_node1 = "命令执行成功...."

    cls_node2 = "命令执行失败...."

    if os.system(os_command) == 0:

        print "\n\033[1;32;40m%s\033[0m" % cls_node1

    else:

        print "\n\033[1;31;40m%s\033[0m" % cls_node2

def os_commands():

    (status, output) = commands.getstatusoutput('pwd')

    print status, output

def main():

    subproc()

    os_popen()

    os_system()

    os_commands()

if __name__ == "__main__":

    main()