[Python-ideas] Syntax for defining parametric decorators

[Mike Meyer]

On Mon, 09 Jul 2012 11:47:48 +0200
Stefan Behnel <stefan_ml at behnel.de> wrote:
> Mike Graham, 08.07.2012 22:22:
> > def timesn(n)(f):
> >     def inner(y):
> >         return n * f(y)
> >     return inner
> > 
> > which is more concise and looks a lot more like a non-parametric
> > decorator someone might have written already. The syntax is mostly
> > self-explaining and could potentially be useful in other contexts.
> 
> >From an innocent look, I have no idea what the syntax is supposed to mean.
> Clearly doesn't hint at a factory for me.

Does to me. timesn is clearly a function of one argument that is going
to return a callable object that takes one argument. So:

x5 = times(5)
print x5(7)

should print 35.

I'd be interested in seeing an implementation of partial that used
this mechanism. Should be straightforward, but I'm in the midst of a
crunch.

	<mike
-- 
Mike Meyer <mwm at mired.org>		http://www.mired.org/
Independent Software developer/SCM consultant, email for more information.

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