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Showing content from https://mail.python.org/pipermail/python-dev/2012-November/122849.html below:

[Python-Dev] [Python-checkins] cpython (3.3): - Issue #16514: Fix regression causing a traceback when sys.path[0] is None

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On Nov 20, 2012, at 05:12 PM, Brett Cannon wrote:

>Should you also insert None into sys.path_importer_cache to signify there
>is no finder for the path entry? I guess the real problem with that is
>there is no guarantee the path entry is hashable, so that probably won't
>work. So nevermind. =)

I explicitly popped None from path_importer_cache, to try to force it to
ignore the cache.  Maybe it's not totally correct (and in practice probably
doesn't matter), but it WFM.

-Barry

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