Backport PR #34049 on branch 1.0.x (Bug in Series.groupby would raise ValueError when grouping by PeriodIndex level)#34247

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simonjayhawkins merged 2 commits intopandas-dev:1.0.xfrom

simonjayhawkins:backport-of-34049

May 19, 2020

Commits on May 19, 2020

Backport PR #34049 on branch 1.0.x (Bug in Series.groupby would raise ValueError when grouping by PeriodIndex level)
simonjayhawkins
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Merge remote-tracking branch 'upstream/1.0.x' into backport-of-34049
simonjayhawkins
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