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TST: Add test for retaining dtype of datetime columns in DataFrame.to_hdf #61112

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Merged
merged 2 commits into from
Mar 12, 2025
Merged

TST: Add test for retaining dtype of datetime columns in DataFrame.to_hdf #61112

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58e7099
add test for dataframe-to_hdf-datetme64
KevsterAmp Nov 21, 2024
4726d07
improve initialization of series
KevsterAmp Nov 21, 2024
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13 changes: 13 additions & 0 deletions pandas/tests/io/pytables/test_retain_attributes.py
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Original file line number Diff line number Diff line change
Expand Up @@ -90,3 +90,16 @@ def test_retain_index_attributes2(tmp_path, setup_path):
df2.to_hdf(path, key="data", append=True)

assert read_hdf(path, "data").index.name is None


def test_retain_datetime_attribute(tmp_path, setup_path):
path = tmp_path / setup_path
ser = Series(
["2024-08-26 15:13:14", "2024-08-26 15:14:14"],
dtype="datetime64[us, UTC]",
)
dataframe = DataFrame(ser)
dataframe.to_hdf(path, key="Annotations", mode="w")

recovered_dataframe = read_hdf(path, key="Annotations")
tm.assert_frame_equal(dataframe, recovered_dataframe)
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