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Mon Feb 25 03:57:14 CET 2008 · http://mail.python.org/pipermail/python-dev/2008-February/077194.html

On Sat, Feb 23, 2008 at 5:59 PM, Neal Norwitz <nnorwitz at gmail.com> wrote:
> On Sat, Feb 23, 2008 at 8:06 AM, Guido van Rossum <guido at python.org> wrote:
>  >
>  >  I do think map() and filter() should issue a warning under -3 when the
>  >  first arg is None. (Or does 2to3 detect this now?)
>
>  What's wrong with filter(None, seq)?  That currently works in 3k:
>
>  >>> filter(None, range(5))
>  <itertools.ifilter object at 0x2b5be60da450>
>  >>> [x for x in _]
>  [1, 2, 3, 4]

But that's a bug -- it's been spec'ed that this will stop working.
(Can't remember where, perhaps PEP 3100?)

>  (Side note, shouldn't we change the names for filter/map?)

Huh? What? Why?

-- 
--Guido van Rossum (home page: http://www.python.org/~guido/)

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Backporting PEP 3127 to trunk)