Backport PR #40090 on branch 1.2.x#40117

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simonjayhawkins merged 3 commits intopandas-dev:1.2.xfrom

rhshadrach:auto-backport-of-pr-40090-on-1.2.x

Feb 28, 2021

Commits on Feb 1, 2021

Backport PR #39482: ERR: Unify error message for bad excel sheetnames
rhshadrach
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Commits on Feb 26, 2021

Merge branch '1.2.x' of https://github.com/pandas-dev/pandas into 1.2.x
rhshadrach
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Commits on Feb 27, 2021

Backport PR #40090: REG: DataFrame/Series.transform with list and non-list dict values
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