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

[Raymond Hettinger]

Raymond Hettinger added the comment:

What do you guys think about just making the predicate argument optional? 

   filter([-2,0,2]) --> -2, 2
   filter(pred, iterable)

One arg is the first case and two args is the second case.

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