linux上python中的os.system vs子进程 [英] os.system vs subprocess in python on linux

问题描述

我有两个python脚本.第一个脚本调用第二个脚本表，在其中我需要执行第三方python脚本.看起来像这样:

I have two python scripts. The first script calls a table of second scripts in which I need to execute a third party python script. It looks something like this:

# the call from the first script. 
cmd = "qsub -sync y -b -cwd -V -q long  -t 1-10 -tc 5 -N 'script_two' ./script2.py"

script2thread = pexpect.spawn(cmd)

# end of script 1 

所以在这里，我要发送10个作业到队列中.在脚本2中，我有一个基于task_id的case语句.在每个脚本中，我使用不同的参数对第三方脚本进行类似的调用.

So here i am sending 10 jobs out to the queue. In script 2 I have a case statement based on the task_id. In each one I make a similar call to the third party script using different parameters.

...
elif(task_id == 4)
subprocess.call(./script3)

# or 

os.system(./script3 , shell=True)

这是我的问题所在.使用一种或另一种是否有区别/好处?我知道由于支持问题，在Windows上使用一个在另一个上会有很大的不同，但是我在Linux上，并且无意在Windows上运行它.有时，使用子进程会得到非常奇怪的结果，它无法在网络上找到其他东西，而这一次只能运行第三个脚本.

This is where my question lies. Is there a difference/benefit to using one or the other? I know that on windows using one over the other makes a big difference because of support issues but I am on linux and have no intention of running this on windows. Sometimes I get very weird results from using the subprocess, it cannot find other things on the network that it can when the third script is run independently one at a time.

推荐答案

您应使用 subprocess .并不是说有什么区别，它只是一个旨在替换os.system的更新模块(请查看本部分以进行直接替换).如果一天有需要，它还具有更多功能.

You should use subprocess. Not that it makes any difference, it's just a newer module intended to replace os.system (have a look at this section for a drop-in replacement). It also has more features in case you need them one day.

简而言之:没有理由使用os.system(与旧版本的Python兼容除外).

In short: there is no reason to use os.system (except for compatibility with older versions of Python).

这篇关于linux上python中的os.system vs子进程的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！