Inada Naoki <songofaca...@gmail.com> added the comment:
I created two PRs. PR 12307 just optimize inserting to empty dict.
PR 12308 has same optimization and removes shared empty key (ma_keys = NULL).
I confirmed PR 12307 is faster than before about `d = {}; d["a"]=None`.
I'll benchmark them later.
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<https://bugs.python.org/issue30040>
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