CoW: Add warning for chained assignment with fillna #53779
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@jorisvandenbossche I'd appreciate if you can take a look locally, I can't reproduce these failures on Mac |
mroeschke
added
Copy / view semantics
Warnings
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i get similar-looking failures on mac |
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Arm or intel? Purged environment and still can't reproduce... |
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intel |
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Hm shit. Thx for checking |
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This is Python version specific unfortunately... 3.10 has a different ref count compared to 3.11 |
| df = DataFrame({"a": [1, np.nan, 2], "b": 1}) | ||
| df_orig = df.copy() | ||
| if using_copy_on_write: | ||
| with tm.assert_produces_warning(ChainedAssignmentError): |
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There is a helper for this, with tm.raises_chained_assignment_error():, which will take care of the fact that it doesn't raise a warning on PyPy
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doc/source/whatsnew/vX.X.X.rstfile if fixing a bug or adding a new feature.