[issue20035] Suppress 'os.environ was modified' warning on Tcl/Tk tests

[Zachary Ware]

Zachary Ware added the comment:

Here's a slightly less ugly version of the patch.  I would really appreciate some review on this; this should solve a test_idle issue that was exacerbated by issue #15968 (for unknown reasons).

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priority: low -> normal
Added file: http://bugs.python.org/file34564/issue20035.v2.diff

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