Increase edge case check strictness when cols_droplevel contains empty values #62527
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mroeschke
requested changes
Oct 1, 2025
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| # GH 62518 | ||
| df4 = DataFrame( | ||
| columns=MultiIndex.from_arrays( | ||
| [["a", "a", "z", "z"], pd.Categorical([1, 2, 1, 2])], | ||
| ), | ||
| dtype=object, | ||
| ) | ||
| df4["z"] = df4["z"].astype("int64") |
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Could you make this a separate test that uses the exact code snippet in the original issue?
mroeschke
reviewed
Oct 1, 2025
| ), | ||
| dtype=object, | ||
| ) | ||
| meta["z"] = meta["z"].astype("int64") |
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Sorry, one more thing. Could you use tm.assert_frame.equal to assert that meta is equal to a new DataFrame that's the result of this casting?
mroeschke
approved these changes
Oct 2, 2025
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Thanks @matiaslindgren |
eicchen
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Oct 18, 2025
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DataFrame.__setitem__with DataFrame, Categorical level of MultiIndex in pandas 3.x #62518doc/source/whatsnew/vX.X.X.rstfile if fixing a bug or adding a new feature.