[issue29220] Python 3.6 regression/change using logging.addLevelName() to clear a name

[Roundup Robot]

Roundup Robot added the comment:

New changeset adf8312f377f by Vinay Sajip in branch '3.5':
Issue #29220: Improved fix and test.
https://hg.python.org/cpython/rev/adf8312f377f

New changeset a76eed0baa0f by Vinay Sajip in branch 'default':
Issue #29220: Merged fixes from 3.6.
https://hg.python.org/cpython/rev/a76eed0baa0f

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