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TST : Categorical DataFrame.at overwritting row #38085

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Merged
merged 2 commits into from
Nov 26, 2020
Merged

TST : Categorical DataFrame.at overwritting row #38085

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TST: DataFrame.at on categorical with missing
ma3da Nov 26, 2020
2bfe995
Merge remote-tracking branch 'upstream/master' into GH_37763_categori…
ma3da Nov 26, 2020
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19 changes: 18 additions & 1 deletion pandas/tests/indexing/test_at.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3,7 +3,7 @@
import numpy as np
import pytest

from pandas import DataFrame, Series, Timestamp
from pandas import CategoricalDtype, DataFrame, Series, Timestamp
import pandas._testing as tm


Expand All @@ -26,6 +26,23 @@ def test_at_setitem_mixed_index_assignment(self):
ser.at[1] = 22
assert ser.iat[3] == 22

def test_at_setitem_categorical_missing(self):
df = DataFrame(
index=range(3), columns=range(3), dtype=CategoricalDtype(["foo", "bar"])
)
df.at[1, 1] = "foo"

expected = DataFrame(
[
[np.nan, np.nan, np.nan],
[np.nan, "foo", np.nan],
[np.nan, np.nan, np.nan],
],
dtype=CategoricalDtype(["foo", "bar"]),
)

tm.assert_frame_equal(df, expected)


class TestAtSetItemWithExpansion:
def test_at_setitem_expansion_series_dt64tz_value(self, tz_naive_fixture):
Expand Down