For filter and map, list comprehensions and generator expressions are
the answer.
>>> numbers = [5, 9, 56, 34, 1, 24, 37, 89]
>>> [x for x in numbers if x < 30]
[5, 9, 1, 24]
>>> (x for x in numbers if x < 30)
<generator object at 0x00B1FCD8>
>>> list(_)
[5, 9, 1, 24]
Jeremy
On Wed, 23 Mar 2005 10:33:53 -0600 (CST), Ka-Ping Yee
<[EMAIL PROTECTED]> wrote:
> Hey folks,
>
> I'm sitting over here in the AppleScript talk and Jacob is explaining a
> module called 'appscript' that interfaces to the Apple Events system.
>
> What caught my eye was this example:
>
> from appscript import *
> ab = app('Address Book')
> people = ab.people.filter(its.emails != [])
>
> That last line asks the Address Book to select only entries with
> e-mail addresses. The weird 'its' object comes from the appscript
> module -- asking for its properties and using operators causes it
> to set up thunks for you.
>
> 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?
>
> -- ?!ng
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