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Wed Jan 12 00:21:29 CET 2005 · https://mail.python.org/pipermail/python-dev/2005-January/050880.html

Guido van Rossum wrote:
>>My point is that it'd be nice if we could come up with an exception name
>>which could be grokkable without requiring 1) Google, 2) relatively
>>high-level understanding of type theory.
> 
> 
> How about SubstitutabilityError?

That would be far, far better, yes.

> We did that for UnboundLocalError, which subclasses NameError. Perhaps
> we can rename NameError to UnboundVariableError (and add NameError as
> an alias for b/w compat).

Sure, although (and here I'm pushing it, I know, and I should have 
argued it way back then), the notion of 'unbound' is possibly too 
low-level still.  'Unknown' would probably carry much more meaning to 
those people who most need it.

But yes, you're catching my drift.

--david

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[Python-Dev] Re: PEP 246: LiskovViolation as a name