CLN: Use defaultdict for minor optimization#32209

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jaketae wants to merge 3 commits intopandas-dev:masterfrom

jaketae:master

Commits on Feb 23, 2020

Use `defaultdict` for minor optimization
jaketae
authored

Commits on Feb 24, 2020

Omit casting to dictionary
jaketae
authored

Commits on Feb 26, 2020

Merge upstream master
jaketae
committed