[Types-sig] typecase hack

[scott]

Interesting.  Yes, it should work.  Are you proposing this as the way
to do it?  It'd be nice if it works, but my vote has gotta side with
the availability of a more elegant approach.  I think this
disambiguating thing is going to happen a lot, mostly as the result of 
things defaulting to None so often.  I count 147 (is (not)?|==)\s*None
matches in the standard library.

Neat, though.

scott



On Sat, Jan 22, 2000 at 10:41:16AM -0500, Guido van Rossum wrote:
> Just asked me to explain the need for typecase again, and I realized
> that there's a parallel with except clauses.  With only a little bit
> of imagination we could make the official way to spell a typecase as
> follows:
> 
> try: raise x
> except int, xi: ...use xi: int...
> except str, xs: ...use xs: str...
> 
> I'm not saying this is particularly elegant -- but it should work,
> once types and classes are more similar.
> 
> --Guido van Rossum (home page: http://www.python.org/~guido/)
> 
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