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Mon Apr 5 18:09:48 EDT 2004 · http://mail.python.org/pipermail/python-dev/2004-April/044091.html

> presumably the parser could handle this syntax if "as" were a keyword. 

Not really.  The parser is really dumb, it han only handle one
alternative starting with a particular token at any point.  Since '['
can already start an expression and an expression is a valid
statement, anything else also starting with '[', even if it isn't a
valid expression, cannot be accepted.  You may be thinking of Yacc,
which has much more liberal rules.

--Guido van Rossum (home page: http://www.python.org/~guido/)

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[Python-Dev] Re: PEP 318: Decorators last before colon