For review: PEP 308 - If-then-else expression

James J. Besemer jb at cascade-sys.com
Tue Feb 11 09:50:21 CET 2003


holger krekel wrote:

> Do you really know the python parser?  
> 
> Your statements are true for more general parsers.  The Python one
> focuses on simplicity (as so many other parts of python do).
> I had a detailed discussion with Andrew Koenig about this, already.

MY MISTAKE.  The pgen program evidently cannot produce unambigous tables from 
the if/else expression form WITHOUT surrounding parentheses.

Most of my background is with LALR(1) parsers, which I am pretty sure can 
handle the ambiguity.  I understand now that Python uses an LL(1) and I did 
not fully appreciate the limitation of that approach.

Looks like it's moot anyway.

Regards

--jb

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