R. David Murray added the comment:
I had forgotten all about os.path.expandvars. Note, however, that that
function is very naive:
>>> os.path.expandvars("'$HOME'")
"'/home/rdmurray'"
That is, it is doing unconditional substitution, not parsing shell syntax. It
should work well for simple cases, though.
It might be worth throwing up a trial balloon on python-ideas for adding
something to shlex that would do a "better" job of environment variable
substitution for the version of shell syntax that shlex supports, which would
therefore become a sort of platform-independent syntax for doing this.
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<http://bugs.python.org/issue15874>
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