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Wed Mar 23 18:48:08 CET 2005 · https://mail.python.org/pipermail/python-dev/2005-March/052388.html

Paul Moore <p.f.moore at gmail.com> wrote:
> 
> On Wed, 23 Mar 2005 10:33:53 -0600 (CST), Ka-Ping Yee
> <python-dev at zesty.ca> wrote:
> > It dawned on me that you could use this idea to make the whole
> > filter/lambda experience vastly more pleasant.  I whipped up a quick
> > implementation:
> > 
> >     >>> from placeholder import _
> >     >>> numbers = [5, 9, 56, 34, 1, 24, 37, 89]
> >     >>> filter(_ < 30, numbers)
> >     [5, 9, 1, 24]
> >     >>> map(_ + 10, numbers)
> >     [15, 19, 66, 44, 11, 34, 47, 99]
> >     >>>
> > 
> > Look ma, no lambdas!
> > 
> > I bet someone has already done this before, right?
> 
> I thought about it, but couldn't convince myself that it would work
> properly in all cases. I was thinking in terms of operator overloading
> of everything possible - how did you do it?

PyTables allows something very similar for "in-kernel" searches of data,
but only on a single constraint.  I would imagine that Ka-Ping did it by
only allowing a single operation per item.

 - Josiah

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[Python-Dev] Shorthand for lambda