TST: Add regression test for pivot on empty frame with period dtype (GH62705) #63003
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mroeschke
approved these changes
Nov 6, 2025
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Thanks @Nithurshen |
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doc/source/whatsnew/vX.X.X.rstfile if fixing a bug or adding a new feature.This PR adds a regression test for issue #62705.
The original issue reported a
TypeError: Cannot interpret 'period[D]' as a data typewhen.pivot()was called on an empty DataFrame where thevaluescolumn had aPeriodDtype.As noted in the issue, this bug was already fixed on
main, but it lacked a specific regression test to prevent this from reoccurring.This new test:
pd.DataFrame({"index": [], "columns": [], "values": []})valuescolumn to aPeriodDtype(parametrized for "D", "M", "Q", "Y")..pivot()and asserts that the operation completes without an error.float64index/columns and the originalPeriodDtypefor its data, which matches the behavior of the fixed pivot operation.