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Showing content from http://mail.python.org/pipermail/python-dev/2002-August/028146.html below:

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

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> 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

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