python 调用系统命令的两种方法-白红宇

python 调用系统命令的两种方法

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发布时间：2019-06-28

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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)           
         
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