How to evaluate environment variables into a string in Python?

python filesystems environment-variables

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

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

python filesystems environment-variables

In Python 3 you can do:

'{VAR}'.format(**os.environ))

for example

>>> 'hello from {PWD}'.format(**os.environ))hello from /Users/william

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