如何在Python中将环境变量评估为字符串? [英] How to evaluate environment variables into a string in Python?

问题描述

我有一个表示路径的字符串.因为此应用程序在Windows，OSX和Linux上使用，所以我们定义了环境变量以正确映射来自不同文件系统的卷.结果是:

I have a string representing a path. Because this application is used on Windows, OSX and Linux, we've defined environment variables to properly map volumes from the different file systems. The result is:

"$C/test/testing"

我想做的是评估字符串中的环境变量，以便将它们替换为其各自的卷名.我是否缺少特定的命令，还是必须使用os.environ.keys()并手动替换字符串?

What I want to do is evaluate the environment variables in the string so that they're replaced by their respective volume names. Is there a specific command I'm missing, or do I have to take os.environ.keys() and manually replace the strings?

推荐答案

使用

Use os.path.expandvars to expand the environment variables in the string, for example:

>>> os.path.expandvars('$C/test/testing')
'/stackoverflow/test/testing'

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