From c61e229d2a4c54ffb4153e1f0f48126ba33c9cbf Mon Sep 17 00:00:00 2001 From: Pablo Galindo Date: Sun, 28 Oct 2018 22:03:18 +0000 Subject: bpo-33234: Add exact allocation optimization to lists in What's New (GH-10200) In commit 372d705 a new optimization to the list() type was introduced but it was not added to the optimization section in What's new for Python 3.8. --- Doc/whatsnew/3.8.rst | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/Doc/whatsnew/3.8.rst b/Doc/whatsnew/3.8.rst index 05b7d23..758d32e 100644 --- a/Doc/whatsnew/3.8.rst +++ b/Doc/whatsnew/3.8.rst @@ -242,6 +242,11 @@ Optimizations Note that this means that instances can no longer be weak-referenced and that arbitrary attributes can no longer be added to them. +* The :class:`list` constructor does not overallocate the internal item buffer + if the input iterable has a known length (the input implements ``__len__``). + This makes the created list 12% smaller on average. (Contributed by Pablo + Galindo in :issue:`33234`.) + Build and C API Changes ======================= -- cgit v0.12