[Python-Dev] Re: Decorators: vertical bar syntax
Barry Warsaw
barry at python.org
Mon Aug 9 21:53:10 CEST 2004
On Mon, 2004-08-09 at 14:45, David Eppstein wrote:
> > I agree with Paul here. The only reason I suggested | was to make life
> > easier for 3rd party tools.
>
> But does it?
>
> With @, a third party tool has an unambiguous indication of whether a
> line is a decorator. With |, it is not possible to recognize decorators
> with a regular expression, instead you have to do some context-free
> parsing to determine whether some previous line has an unclosed paren
> (in which case the | is a binop rather than a decorator).
Oh ick. I hadn't thought of that, but if that's going to cause a
problem given the current grammar (and I can't test that atm), then I'm
going to have to retract my support for |.
-Barry
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