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

Raymond Hettinger python at rcn.com
Sun Aug 8 21:57:17 CEST 2004

> > 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 |.

An exclamation point would be better in this regard.

Raymond

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