通过python脚本设置外壳环境变量 [英] Set shell environment variable via python script

问题描述

我有一些仪器需要环境变量，我想从python代码中自动设置该变量.因此，我尝试了几种方法来实现它，但是没有一个成功. 以下是一些示例:

I have some instrument which requires environment variable which I want to set automatically from python code. So I tried several ways to make it happen, but none of them were successful. Here are some examples:

1. 我在python脚本中插入以下代码

1. I insert following code in my python script

import os
os.system("export ENV_VAR=/some_path")

我创建了bash脚本(env.sh)并从python运行它:

I created bash script(env.sh) and run it from python:

#!/bin/bash
export ENV_VAR=some_path

#call it from python
os.system("source env.sh")

我还尝试了 os.putenv()和 os.environ ["ENV_VAR"] ="some_path"

I also tried os.putenv() and os.environ["ENV_VAR"] = "some_path"

是否可以使用python设置(导出)环境变量，即 而不直接将其导出到shell?

Is it possible to set(export) environment variable using python, i.e without directly exporting it to shell?

推荐答案

只要启动"instrument" (我猜想是一个脚本)，它应该在完全相同的过程中起作用:

As long as you start the "instrument" (a script I suppose) from the very same process it should work:

In [1]: os.putenv("VARIABLE", "123")

In [2]: os.system("echo $VARIABLE")
123

您不能更改其他进程或父进程的环境变量.

You can't change an environment variable of a different process or a parent process.

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