[issue5051] test_update2 in test_os.py invalid due to os.environ.clear() followed by reliance on environ COMSPEC

[Mark Lawrence]

Changes by Mark Lawrence <breamoreboy at yahoo.co.uk>:


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type:  -> behavior
versions: +Python 3.5

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue5051>
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