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

[STINNER Victor]

STINNER Victor added the comment:

I checked Python 2 for map(): it gets the length hint of all iterables and
use the maximum, with a default of 8. I'm not sure of what you mean by
errors, the function to get the length hint already catchs and ignores
errors no?

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue26828>
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