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TST: Add test for pd.read_csv date parsing not working with dtype_backend="pyarrow" and missing values #60286

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merged 7 commits into from
Nov 15, 2024
Merged

TST: Add test for pd.read_csv date parsing not working with dtype_backend="pyarrow" and missing values #60286

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babed36
add test func
KevsterAmp Nov 12, 2024
574d129
remove io since StringIO is already imported
KevsterAmp Nov 12, 2024
5a9a935
add td.skip_if_no("pyarrow") from CI errors
KevsterAmp Nov 12, 2024
b2602cc
Merge remote-tracking branch 'upstream/main' into add-dataframe-pyarr…
KevsterAmp Nov 14, 2024
30b2149
fix test
KevsterAmp Nov 14, 2024
4812f69
improve expect_data; remove assert on "date" column dtype
KevsterAmp Nov 15, 2024
44164ce
Merge remote-tracking branch 'upstream/main' into add-dataframe-pyarr…
KevsterAmp Nov 15, 2024
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14 changes: 14 additions & 0 deletions pandas/tests/io/test_common.py
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Original file line number Diff line number Diff line change
Expand Up @@ -674,3 +674,17 @@ def test_pickle_reader(reader):
# GH 22265
with BytesIO() as buffer:
pickle.dump(reader, buffer)


@td.skip_if_no("pyarrow")
def test_pyarrow_read_csv_datetime_dtype():
# GH 59904
data = '"date"\n"20/12/2025"\n""\n"31/12/2020"'
result = pd.read_csv(
StringIO(data), parse_dates=["date"], dayfirst=True, dtype_backend="pyarrow"
)

expect_data = pd.to_datetime(["20/12/2025", pd.NaT, "31/12/2020"], dayfirst=True)
expect = pd.DataFrame({"date": expect_data})

tm.assert_frame_equal(expect, result)