如何在 Python 中将环境变量评估为字符串?
问题描述
我有一个代表路径的字符串.因为这个应用程序在 Windows、OSX 和 Linux 上使用，我们已经定义了环境变量来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:
"$C/test/testing"
我想要做的是评估字符串中的环境变量，以便将它们替换为各自的卷名.是否有我遗漏的特定命令，或者我必须采取 os.environ.keys() 并手动替换字符串?
What I want to do is evaluate the environment variables in the string so that they're replaced by their respective volume names. Is there a specific command I'm missing, or do I have to take os.environ.keys() and manually replace the strings?
解决方案
使用 os.path.expandvars 展开字符串中的环境变量，例如:
Use os.path.expandvars to expand the environment variables in the string, for example:
>>> os.path.expandvars('$C/test/testing')
'/stackoverflow/test/testing'
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