BUG: empty slice assignment raises if datetime column is present #50942 #62934
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mroeschke
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Oct 31, 2025
pandas/tests/indexing/test_loc.py
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| DataFrame({"A": [datetime(2025, 10, 30)]}), | ||
| DataFrame({"A": [Timestamp(2025, 10, 30)] * 2}), | ||
| DataFrame({"A": [Timedelta(1)]}), | ||
| DataFrame({"A": [Timedelta(1), Timedelta(2)]}), |
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Can you construct the DataFrame in the body of the test?
mroeschke
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Oct 31, 2025
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mroeschke
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Nov 4, 2025
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| try: | ||
| df = DataFrame(data=data, columns=["A"]) | ||
| res = df.loc[mask] | ||
| res = df | ||
| tm.assert_frame_equal(res, df) | ||
| except Exception: | ||
| pytest.fail("loc empty slice assignment raised Exception unexpectedly!") |
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- You can remove the
try/except - In the original issue, it's testing a setitem, so this would need to be
expected = df.copy()
df.loc[mask] = df
tm.assert_frame_equal(df, expected) 
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doc/source/whatsnew/vX.X.X.rstfile if fixing a bug or adding a new feature.