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Wed Apr 21 18:17:55 CEST 2010 · https://mail.python.org/pipermail/python-dev/2010-April/099613.html

help() on an Exception class lists the method resolution order (effectively the inheritance hierarchy).
E.g. help(ArithmeticError) displays inter alia:

Method resolution order:
    ArithmeticError
    StandardError
    Exception
    BaseException
    __builtin__.object

Would it be possible for it also display the Python built-in SUBclasses of the class?  E.g. in the same example something like:

Built-in subclasses:
    FloatingPointError
    OverflowError
    ZeroDivisionError

This may seem pointless to grizzled old Python veterans who (maybe) know the inheritance hierarchy backwards, but for those of us with less experience I think it would be helpful, e.g.
(1) It would help to track down an Exception whose name you have forgotten.
(2) It would sometimes be illuminating, e.g. LookupError might be a bit obscure at first, until you see that it is the superclass of the familiar IndexError and KeyError.

Sorry, I'm not sure if I should send this sort of thing to Python-Ideas or Python-Dev, so please let me know gently which one I should (not) have sent it to.

Best wishes
Rob Cliffe
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[Python-Dev] Small suggestion re help(Exception)