[issue32071] Add py.test-like "-k" test selection to unittest

[Jonas H.]

Jonas H. <jonas at lophus.org> added the comment:

https://github.com/python/cpython/pull/4589

- Add 3.7 What's New entry
- Fix regression (thanks Tim for the report)

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue32071>
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