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TST: add test to verify column does not lose categorical type when using loc #37988

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Merged
merged 4 commits into from
Nov 23, 2020
Merged

TST: add test to verify column does not lose categorical type when using loc #37988

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40a99dd
add test to verify column does not lose categorical type when using loc
fgebhart Nov 21, 2020
0452a41
move test and compare with expected df
fgebhart Nov 22, 2020
353bce1
move again and rename function
fgebhart Nov 22, 2020
ef9daf4
use ordered fixture for categorical
fgebhart Nov 23, 2020
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7 changes: 7 additions & 0 deletions pandas/tests/dtypes/test_dtypes.py
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Original file line number Diff line number Diff line change
Expand Up @@ -998,3 +998,10 @@ def test_period_dtype_compare_to_string():
dtype = PeriodDtype(freq="M")
assert (dtype == "period[M]") is True
assert (dtype != "period[M]") is False


def test_column_not_loses_categorical_when_using_loc():
# GH16360
df = pd.DataFrame({"A": [1]})
df.loc[:, "B"] = Categorical(["a"])
assert is_categorical_dtype(df["B"])