[issue25641] urllib/request.py/getproxies_environment() throws "dictionary changed size during iteration" error occasionally

[Raymond Hettinger]

Raymond Hettinger added the comment:

For a simple fix, 2393 should probably read:

    for name, value in list(os.environ.items()):

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nosy: +rhettinger

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<http://bugs.python.org/issue25641>
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