[Python-Dev] Re: Decorators: vertical bar syntax (original) (raw)

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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