python 调用系统命令的两种方法

本文转自http://www.cnblogs.com/xuxm2007/archive/2011/01/17/1937220.html

Python中执行系统命令常见方法有两种：

两者均需 import os

(1) os.system

# 仅仅在一个子终端运行系统命令，而不能获取命令执行后的返回信息

system(command) -> exit_status
Execute the command (a string) in a subshell.

# 如果再命令行下执行，结果直接打印出来

1	>>> os.system('ls')

3	11.wmvbooks     downloads   Pictures  python

02

>>>tmp

04	['dump_db_pickle.py ',

06	'dump_db_shelve.py ',

08	'__init__.py ',

10	'make_db_pickle_recs.py ',

12	'peopleinteract_query.py ',

14	'testargv.py ',

16	'update_db_pickle.py ',

2	>>> subprocess.call (["cmd", "arg1", "arg2"],shell=True)

获取返回和输出:

1	importsubprocess

3	forline inp.stdout.readlines():

5	retval =p.wait()

(4)  使用模块commands模块

1	>>> importcommands

3	['__all__', '__builtins__', '__doc__', '__file__', '__name__', 'getoutput', 'getstatus','getstatusoutput', 'mk2arg', 'mkarg']

5	'Wed Jun 10 19:39:57 CST 2009'

7	>>> commands.getstatusoutput("date")

查看源代码

打印

1	Traceback (most recent call last):

3

main()

5	fax.sendFax()

7	os.popen(cmd)

<div alt2"="" style="margin: 0px !important; padding: 0px !important; border: 0px !important; outline: 0px !important; font-size: 1em !important; vertical-align: baseline !important; background-image: none !important; background-color: rgb(248, 248, 248) !important; float: none !important; position: static !important; left: auto !important; top: auto !important; right: auto !important; bottom: auto !important; height: auto !important; width: auto !important; line-height: 1.1em !important; direction: ltr !important;">

8	UnicodeEncodeError: 'ascii'codec can't encode characters inposition 46-52: ordinal not inrange(128)

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