使用 Python 子进程通信方法时如何获取退出代码?

2022-01-18 00:00:00 python subprocess

问题描述

使用 Python 的 subprocess 模块和 communicate() 方法时如何检索退出代码?

How do I retrieve the exit code when using Python's subprocess module and the communicate() method?

相关代码:

import subprocess as sp
data = sp.Popen(openRTSP + opts.split(), stdout=sp.PIPE).communicate()[0]

我应该换一种方式吗?

解决方案

Popen.communicate 将在完成时设置 returncode 属性(*).以下是相关文档部分:

Popen.communicate will set the returncode attribute when it's done(*). Here's the relevant documentation section:

Popen.returncode 
  The child return code, set by poll() and wait() (and indirectly by communicate()). 
  A None value indicates that the process hasn’t terminated yet.

  A negative value -N indicates that the child was terminated by signal N (Unix only).

所以你可以这样做(我没有测试它，但它应该可以工作):

So you can just do (I didn't test it but it should work):

import subprocess as sp
child = sp.Popen(openRTSP + opts.split(), stdout=sp.PIPE)
streamdata = child.communicate()[0]
rc = child.returncode

<小时>

(*) 发生这种情况是因为它的实现方式:在设置线程来读取孩子的流之后，它只是调用 wait.

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