[Python-Dev] PEP 218 (sets); moving set.py to Lib

Delaney, Timothy tdelaney@avaya.com
Wed, 21 Aug 2002 16:26:24 +1000

> From: Guido van Rossum [mailto:guido@python.org]
> OK, from the checkins:
> - Changed the NotImplementedError in BaseSet.__init__ to TypeError,
>   both for consistency with basestring() and because we have to use
>   TypeError when denying Set.__hash__.  Together those provide
>   sufficient evidence that an unimplemented method needs to raise
>   TypeError.

Hmm ... is there a case that NotImplementedError should be a subclass of
TypeError? Conceptually it would make sense (this *type* does not implement
this method).

Of course, it would probably also break code ...

Tim Delaney