pythoncommands模块的适用方式

FUNCTioNS
    getoutput(cmd)
        Return output (stdout or stderr) of executing cmd in a shell.
    getstatus(file)
        Return output of "ls -ld <file>" in a string.
    getstatusoutput(cmd)
        Return (status, output) of executing cmd in a shell.

>>> import commands
>>> status, output = commands.getstatusoutput("ls")
>>> print status
0
>>> print output
atom:
bookstore
cookie.py~

commands.getstatus（file）

commands.getoutput(cmd)

>>> print commands.getoutput("ls")
atom:
bookstore
cookie.py~