[issue2186] map and filter shouldn't support None as first argument (in Py3k only)

[Alexander Belopolsky]

Alexander Belopolsky added the comment:

Attached patch removes support for None from filter and 
itertools.ifilter.  My objections for removing that from map do not 
apply because bool function can be used instead of None in filter 
achieving similar performance and better clarity.

None support was apparently removed from map in r60206.

Remaining questions:

1. map(None,[]), filter(None,[]) and in fact map(anything,[]) still 
work.  I don't think that needs to be fixed.

2. Should None support be removed from itertools.ifilterfalse? I would 
guess yes, unless it is going away.

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keywords: +patch
Added file: http://bugs.python.org/file9551/filter.diff

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