[Python-Dev] future_builtins (was: Backporting PEP 3127 to trunk)

[Neal Norwitz]

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]

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

n