R. David Murray <rdmur...@bitdance.com> added the comment:

Yeah, making a generic way to put specific tests into a subprocess run sounds 
like a better solution.

But...

The xml error in test___all__ is due to the fact that test___all__ imports 
site.  So even with the above we'd need to special case site in test___all__.  
This probably answers the question of why more tests show as changing the 
environment when run with -S -s, so there are probably other tests that would 
need to be touched as well.

This is becoming a bit of a jerry-rig.  Anyone have a better idea?  A way to 
identify the "system paths" (or, conversely, identify the paths *not* added by 
site) and delete them in regrtest before running the tests might be cleaner.

Or another idea: change site so that it does not execute on import, but instead 
the machinery that currently imports test site runs a 'setup' function after it 
does the import.  If test_site were then to test the setup function and take 
care to restore sys.path when it was done, I think things would work as 
expected if all tests were run with -S -s.  Of course, this would break all the 
custom site.py's out there, so it is probably a non-starter of an idea.

In the meantime, test___all__ could perhaps be made more robust in the face of 
import errors/warnings for those few modules that import from external 
libraries (xml, logging...anything else?)

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue1674555>
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