[issue37435] builtin map iterator should provide __length_hint__

New submission from Nicholas Musolino : The builtin `map` function takes one or more user-supplied iterators, and returns an iterator. When all the user-supplied iterator arguments to `map` provide a valid length hint (according to the PEP 424 length hint protocol), the iterator returned by

[issue37435] builtin map iterator should provide __length_hint__

Change by Nicholas Musolino : -- keywords: +patch pull_requests: +14248 stage: -> patch review pull_request: https://github.com/python/cpython/pull/14432 ___ Python tracker <https://bugs.python.org/issu

[issue37435] builtin map iterator should provide __length_hint__

Nicholas Musolino added the comment: Thanks, Serihy. I can close this issue. I actually have been looking at this problem for some time, and created a patch, but don't what the "length transparency issues" that led to #26828 being closed. Do you think I should close this

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

Change by Nicholas Musolino : -- pull_requests: +14249 pull_request: https://github.com/python/cpython/pull/14432 ___ Python tracker <https://bugs.python.org/issue26

[issue37435] builtin map iterator should provide __length_hint__

Change by Nicholas Musolino : -- stage: patch review -> resolved status: open -> closed ___ Python tracker <https://bugs.python.org/issue37435> ___ ___ Pyth

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

Nicholas Musolino added the comment: Before seeing this issue and its closed status, I created PR 14432, which adds `__length_hint__()` to the iterator returned by builtin `map`. This PR differs from the original 2017 PR by MSeifert in that the code can distinguish between the cases where a

[issue33234] Improve list() pre-sizing for inputs with known lengths

Change by Nicholas Musolino : -- pull_requests: +14316 pull_request: https://github.com/python/cpython/pull/14432 ___ Python tracker <https://bugs.python.org/issue33