Patches item #1748960, was opened at 2007-07-06 12:06
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Category: Modules
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Geoffrey Bache (gjb1002)
Assigned to: Nobody/Anonymous (nobody)
Summary: Extra optional argument to os.path.expandvars
Initial Comment:
I've several times wanted to expand a string in the way that os.path.expandvars
does, but without modifying the actual environment.
If for example I have
inputString = "$ROOT/${SUBDIR}/some/path"
and I want to find expanded versions of this, I have to do something like
os.environ["ROOT"] = "/users/geoff"
os.environ["SUBDIR"] = "subdir"
fullPath = os.path.expandvars(inputString)
The problem is that my program is multithreaded and I don't want to globally
change os.environ. All I want is the information "fullPath". I'd like to be
able to create a local "env" dictionary and pass it to os.path.expandvars as an
optional second argument.
I attach a patch for posixpath.py and ntpath.py, though this is untested and is
intended to show what I mean in practice.
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