regrtest.py --verbose test_importlib fails with various errors on Vista, 
including:
Traceback (most recent call last):
  File 
"D:\pydev\python\branches\py3k\lib\importlib\test\source\test_abc_loader
.py", line 149, in test_package
    __loader__=mock)
  File 
"D:\pydev\python\branches\py3k\lib\importlib\test\source\test_abc_loader
.py", line 126, in eq_attrs
    self.assertEqual(getattr(ob, attr), val)
AssertionError: ['/path/to/<pkg>/__init__'] != ['/path/to/<pkg>']

Can you svn up and run them again? Some stuff has changed if you are
running against 3.1a1.

Still get this, python_d.exe, Vista64 (32 bit py), VS2008:


======================================================================
FAIL: test_package (importlib.test.source.test_abc_loader.PyLoaderTests)
----------------------------------------------------------------------
Traceback (most recent call last):
  
File "D:\pydev\python\branches\py3k\lib\importlib\test\source\test_abc_l
oader.py", line 151, in test_package
    __loader__=mock)
  
File "D:\pydev\python\branches\py3k\lib\importlib\test\source\test_abc_l
oader.py", line 128, in eq_attrs
    "{} attribute: {} != {}".format(attr, found, val))
AssertionError: __path__ attribute: ['/path/to/<pkg>/__init__'] != 
['/path/to/<pkg>']

======================================================================
FAIL: test_package 
(importlib.test.source.test_abc_loader.PyPycLoaderTests)
----------------------------------------------------------------------
Traceback (most recent call last):
  
File "D:\pydev\python\branches\py3k\lib\importlib\test\source\test_abc_l
oader.py", line 266, in test_package
    mock, name = super().test_package()
  
File "D:\pydev\python\branches\py3k\lib\importlib\test\source\test_abc_l
oader.py", line 151, in test_package
    __loader__=mock)
  
File "D:\pydev\python\branches\py3k\lib\importlib\test\source\test_abc_l
oader.py", line 128, in eq_attrs
    "{} attribute: {} != {}".format(attr, found, val))
AssertionError: __path__ attribute: ['/path/to/<pkg>/__init__'] != 
['/path/to/<pkg>']

----------------------------------------------------------------------
Ran 166 tests in 0.276s

FAILED (failures=2)
test test_importlib failed -- errors occurred; run in verbose mode for 
details
1 test failed:
    test_importlib
[64246 refs]

This is latest python/branches/py3k, btw.

Thanks, Kristján, for the quick response. I will see if I can figure why
the heck this is differing on Vista (almost all the code is
platform-agnostic Python so this will be an "interesting" thing to try
to fix).

There is another issue with testing on Vista, which I have noticed but 
I don't think apply to this issue:
os.unlink(testfilename)
followed by
open(testfilename, 'w')
often fails, because the unlink() operation on vista doesn't 
immediately reflect on the disk!  You get strange and unpredictable 
regression failures because of this.  It is enough to catch the error, 
sleep for a millisecond and try again to overcome this.  If we start 
regular regression testing on Vista, this is onething that needs 
fixing, probably with a tmpfile utility function in test_support.py

Perhaps CCP could contribute a buildbot with Server2008 (=Vista) to 
test the main branches...  not making any promises.

I committed a fix in r71057 where instead of hard-coding the paths I
moved over to os.path.join(). Let me know if that fixes it.

As for the deletion hole that Vista has, it could be added to
test.test_support.unlink(), but talking here at PyCon it sounds like it
might be up to 15 seconds which is way too long to wait for a file
deletion to complete. Might need to create a context manager that
creates unique files every time. But all of this should be covered in
another issue.

It works now!
Good work, Brett.