从 Python 脚本子进程获取输出 [英] Getting output from a Python script subprocess

问题描述

这可能是一个愚蠢的问题，但我有一个 Python 脚本来启动一个子进程(也是一个 Python 脚本)，我需要该子进程返回三个整数.如何从启动子进程的 Python 脚本中获取这些返回值?我是否必须将整数输出到标准输出，然后使用 check_output() 函数?

This may be a stupid question but I have a Python script that starts a subprocess (also a Python script) and I need that subprocess to return three integers. How do I get those return values from the Python script that starts the subprocess? Do I have to output the integers to stdout and then use the check_output() function?

推荐答案

答案是是...我想要 +15 的声望！！:-D

The answer is Yes... I want my +15 reputation!! :-D

不，真的......一旦你开始处理子进程，你真正需要与它们通信的唯一方法就是通过文件(这就是stdout、stderr最后就是这样)

No, seriously... Once you start dealing with subprocesses, the only way you really have to communicate with them is through files (which is what stdout, stderr and such are, in the end)

所以你要做的就是获取输出并检查发生了什么(可能还有生成的进程'exit_code，如果一切顺利，它将为零)请记住stdout 的内容(您将使用 check_output 函数获得)是一个字符串.因此，为了获得这三个项目，您必须以某种方式拆分该字符串...

So what you're gonna have to do is grab the output and check what happened (and maybe the spawned process' exit_code, which will be zero if everything goes well) Bear in mind that the contents of stdout (which is what you'll get with the check_output function) is an string. So in order to get the three items, you'll have to split that string somehow...

例如:

import subprocess

output = subprocess.check_output(["echo", "1", "2", "3"])
print "Output: %s" % output
int1, int2, int3 = output.split(' ')
print "%s, %s, %s" % (int1, int2, int3)

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