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bpo-33234: Add exact allocation optimization to lists in What's New #10200

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Merged
pablogsal merged 3 commits into from
Oct 28, 2018
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bpo-33234: Add exact allocation optimization to lists in What's New #10200

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Add exact allocation optimization to lists in What's New
pablogsal Oct 28, 2018
764858a
fixup! Add exact allocation optimization to lists in What's New
pablogsal Oct 28, 2018
0075e0a
fixup! fixup! Add exact allocation optimization to lists in What's New
pablogsal Oct 28, 2018
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5 changes: 5 additions & 0 deletions 5 Doc/whatsnew/3.8.rst
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Expand Up @@ -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`.)


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