[issue26828] Implement __length_hint__() on map() and filter() to optimize list(map) and list(filter)

[Raymond Hettinger]

Raymond Hettinger added the comment:

[STINNER Victor]
> Oh, there is no slot for __length_hint__(). 
> Maybe we should also try to add a new slot for it?

+1

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<http://bugs.python.org/issue26828>
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