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GH-49255: [Python] Fix pandas Categorical DeprecationWarnings in tests #50543

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rok merged 3 commits into from
Jul 18, 2026
Merged

GH-49255: [Python] Fix pandas Categorical DeprecationWarnings in tests #50543

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GH-49255: [Python] Fix pandas Categorical DeprecationWarnings in tests
GujaLomsadze Jul 18, 2026
ce2174e
GH-49255: [Python] Treat out-of-category Categorical deprecation as e…
GujaLomsadze Jul 18, 2026
9ecdde8
GH-49255: [Python] Add test asserting the Categorical deprecation is …
GujaLomsadze Jul 18, 2026
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16 changes: 12 additions & 4 deletions python/pyarrow/tests/test_pandas.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3095,8 +3095,6 @@ def test_category(self):

arrays = {
'cat_strings': pd.Categorical(v1 * repeats),
'cat_strings_with_na': pd.Categorical(v1 * repeats,
categories=['foo', 'bar']),
'cat_ints': pd.Categorical(v2 * repeats),
'cat_binary': pd.Categorical(v3 * repeats),
'cat_strings_ordered': pd.Categorical(
Expand All @@ -3121,13 +3119,23 @@ def _check(v):
tm.assert_series_equal(pd.Series(result), pd.Series(v))

arrays = [
pd.Categorical(['a', 'b', 'c'], categories=['a', 'b']),
pd.Categorical(['a', 'b', 'c'], categories=['a', 'b'],
pd.Categorical(['a', 'b', None], categories=['a', 'b']),
pd.Categorical(['a', 'b', None], categories=['a', 'b'],
ordered=True)
]
for arr in arrays:
_check(arr)

def test_category_construction_deprecation(self):
# GH-49255
if Version(pd.__version__) < Version("3.0.0"):
pytest.skip("out-of-category deprecation added in pandas 3.0")
with pytest.warns(
DeprecationWarning,
match="Constructing a Categorical with a dtype and "
"values containing non-null entries"):
pd.Categorical(['a', 'b', 'c'], categories=['a', 'b'])

def test_empty_category(self):
# ARROW-2443
df = pd.DataFrame({'cat': pd.Categorical([])})
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2 changes: 2 additions & 0 deletions python/setup.cfg
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Expand Up @@ -27,6 +27,8 @@ filterwarnings =
error:The SparseDataFrame:FutureWarning
# https://github.com/apache/arrow/issues/38239
ignore:Setting custom ClientSession:DeprecationWarning
# https://github.com/apache/arrow/issues/49255
error:Constructing a Categorical with a dtype and values containing non-null entries:DeprecationWarning
# Get a debug traceback when a test takes a really long time
faulthandler_timeout = 300

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