How to evaluate environment variables into a strin

问题:

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"

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?

回答1:

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

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