[issue25731] Assigning and deleting __new__ attr on the class does not allow to create instances of this class

[Eryk Sun]

Change by Eryk Sun <eryk...@gmail.com>:


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versions: +Python 3.10, Python 3.8, Python 3.9 -Python 2.7, Python 3.5, Python 
3.6, Python 3.7

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<https://bugs.python.org/issue25731>
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