[New-bugs-announce] [issue39585] Delete a pending item in _warning.c

[hai shi]

New submission from hai shi <shihai1991 at 126.com>:

a pend item could be removed (https://github.com/python/cpython/blob/master/Python/_warnings.c#L493).

two reasons:
1) every warning have `__name__` and it must not NULL(`The tp_name slot must be set;` from pep0253)
2) the `__name__` of Warning class(including children class) can not be removed.

```
>>> del UserWarning.__name__
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: can't set attributes of built-in/extension type 'UserWarning'
```

----------
components: Interpreter Core
messages: 361630
nosy: shihai1991
priority: normal
severity: normal
status: open
title: Delete a pending item in _warning.c
versions: Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39585>
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