Bug report

Bug description:

(I've tagged this as a "docs" issue because help() is arguably a part of the documentation. Also, some of the docs entries have a similar lack of details. I suppose that could be dealt with separately.)

The help() text for (at least some) builtin exceptions doesn't show the type-specific signature for __init__() (or __new__()), instead showing a generic one with (self, /, *args, **kwargs).

Here's an example (in the REPL) ¹:

>>> help(ExceptionGroup)
 | ...
 |  __init__(self, /, *args, **kwargs)
 |      Initialize self.  See help(type(self)) for accurate signature.
 | ...

(The help() entry for __new__() is likewise unhelpful.)

There is a similar lack of information in the docs, though a handful of entries have at least some signature information.

All builtin exceptions (best effort catalog):

* I derived expected signatures from the content of Objects/exceptions.c.
† The doc entries for OSError, ExceptionGroup, and SyntaxError imply that they each take keyword arguments but they do not.
‡ The doc entries for OSError and SyntaxError do not include the alternate signature.

CPython versions tested on:

CPython main branch

Operating systems tested on:

No response