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bpo-46845: Reduce dict size when all keys are Unicode (GH-31564)

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Inada Naoki 2022-03-02 08:09:28 +09:00 • committed by GitHub
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@ -404,6 +404,11 @@ Optimizations
larger *k*).
(Contributed by Serhiy Storchaka in :issue:`37295`.)
* Dict don't store hash value when all inserted keys are Unicode objects.
This reduces dict size. For example, ``sys.getsizeof(dict.fromkeys("abcdefg"))``
becomes 272 bytes from 352 bytes on 64bit platform.
(Contributed by Inada Naoki in :issue:`46845`.)
CPython bytecode changes
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