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> Mmmh, the problem with Perl's approach is that it changes the current
> working directory (calls to chdir()), which is process-specific and not
> thread-specific. Currently, no function in shutil changes the current
> working directory, which is a nice behaviour and should IMO be preserved.
Using chdir() makes sense and it doesn't look like a too big problem to me:
def rmtree(...):
 ...
 curdir = os.getcwd()
 try:
 call chdir() as required
 finally:
 try:
 os.chdir(curdir)
 except:
 warnings.warn("Unable to chdir to previous current dir")
 ...