gh-123446: Fix empty function names in TypeErrors in typeobject

[sobolevn]

The second option was to convert these functions to use check_num_args(args, ...), but this feels like a simplier solution.

After:

>>> str.join.__get__()
Traceback (most recent call last):
  File "<python-input-1>", line 1, in <module>
    str.join.__get__()
    ~~~~~~~~~~~~~~~~^^
TypeError: __get__ expected at least 1 argument, got 0

• Issue: PyArg_UnpackTuple is used with name="" #123446

[sobolevn]

After the last change:

>>> int().__pow__()
Traceback (most recent call last):
  File "<python-input-0>", line 1, in <module>
    int().__pow__()
    ~~~~~~~~~~~~~^^
TypeError: expected 1 or 2 arguments, got 0
>>> int().__mul__()
Traceback (most recent call last):
  File "<python-input-1>", line 1, in <module>
    int().__mul__()
    ~~~~~~~~~~~~~^^
TypeError: expected 1 argument, got 0
>>> int().__rmul__()
Traceback (most recent call last):
  File "<python-input-2>", line 1, in <module>
    int().__rmul__()
    ~~~~~~~~~~~~~~^^
TypeError: expected 1 argument, got 0

Do I need to test this? Seems rather small, but in a very critical part 🤔

[serhiy-storchaka]

LGTM.

[serhiy-storchaka]

This could also be moved into check_pow_args (or rather unpack_pow_args).

BTW, it is still a question whether __rpow__ and __ipow__ should support the third argument. Normally they never called with three arguments. So it may be better to leave the current PR code, it will be easier to change in future.

[sobolevn]

Yes, we can open a new issue about that. For now, we only change the error message, not any logical parts. Thanks a lot for the review! 👍