1.用os.system(cmd) 不过取不了返回值
2.用os.popen(cmd) 要得到命令的输出内容，只需再调用下read()或readlines()等 如a=os.popen(cmd).read()
3.用 commands 模块。其实也是对popen的封装。此模块主要有如下方法
>>> import commands >>> commands.getstatusoutput(‘ls /bin/ls‘) (0, ‘/bin/ls‘) >>> commands.getstatusoutput(‘cat /bin/junk‘) (256, ‘cat: /bin/junk: No such file or directory‘) >>> commands.getstatusoutput(‘/bin/junk‘) (256, ‘sh: /bin/junk: not found‘) >>> commands.getoutput(‘ls /bin/ls‘) ‘/bin/ls‘ >>> commands.getstatus(‘/bin/ls‘) ‘-rwxr-xr-x 1 root 13352 Oct 14 1994 /bin/ls‘
原文：http://www.cnblogs.com/Simon-xm/p/4090453.html