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

[Raymond Hettinger]

Raymond Hettinger added the comment:

Okay.  Will drop None in favor of bool() in ifilter and ifilterfalse. 
Also, it looks like there agreement on dropping None for map() and 
going forward with the operator.identity() patch.  Will check these in 
in the next couple of days.

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<http://bugs.python.org/issue2186>
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