BUG: Groupby head/tail with axis=1 fails #37777
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black pandasgit diff upstream/master -u -- "*.py" | flake8 --diffThis potentially closes #9772. The other issue there involves the perhaps unexpected fact that using
axis=1withgroupby(...).applydoes not transpose the groups that the function is going to be applied to. I've expressed my thoughts on why we should not do so in #9772 (comment).