[issue8525] Display exceptions' subclasses in help()

[Sanyam Khurana]

Sanyam Khurana <sanyam.khurana01 at gmail.com> added the comment:

Hi,

My perception with all the discussion and WIP patch is that we can ideally limit the no. of subclasses shown only for object, and not for any other class.

>From that list, the only unhelpful ones with > 4 items, in my opinion, appear to be `object`, since that just tells you every type that exists, and `tuple`, because that lists every single namedtuple.

> So it is USEFUL to know ALL subclasses of a given Exception class

+1

> I agree with this - most of the value here comes from showing the full set of exceptions. If we don't do that, we should probably point the user to calling `cls.__subclasses__()` so they can inspect the full list

I agree with this. I would propose to only limit to 4 classes for subclasses of `object` and for everything else displaying all the subclasses. We can optionally display the message to call `cls.__subclasses()` in the case when `help(object)` is called.

How does it sound?

----------

_______________________________________
Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue8525>
_______________________________________