BUG: Groupby.apply wasn't allowing for functions which return lists#31456

Merged

jreback merged 13 commits intopandas-dev:masterfrom

MarcoGorelli:issue-31441

Feb 1, 2020

Commits on Jan 31, 2020

fix bug which prevented .apply to being called with function which returned list

Marco Gorelli
authored and
MarcoGorelli
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:pencil: reword whatsnew

Marco Gorelli
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change fix according to review

Marco Gorelli
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Revert patch to original

Marco Gorelli
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MarcoGorelli
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special case series rather than list
MarcoGorelli
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special case dataframe as well
MarcoGorelli
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keep is_scalar in
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