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TST: Dataframe KeyError when getting nonexistent category (#28799) #28809

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Merged
merged 3 commits into from
Oct 8, 2019
Merged

TST: Dataframe KeyError when getting nonexistent category (#28799) #28809

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TST: Dataframe KeyError when getting nonexistant category (#28799)
bravech Oct 6, 2019
4f21cd1
TST: Changed location and fixed typo for test resolving (#28799)
bravech Oct 7, 2019
1865eb8
Merge remote-tracking branch 'upstream/master' into dataframe-categor…
bravech Oct 7, 2019
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11 changes: 11 additions & 0 deletions pandas/tests/groupby/test_categorical.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1207,3 +1207,14 @@ def test_groupby_cat_preserves_structure(observed):
)

assert_frame_equal(result, expected)


def test_get_nonexistent_category():
# Accessing a Category that is not in the dataframe
df = pd.DataFrame({"var": ["a", "a", "b", "b"], "val": range(4)})
with pytest.raises(KeyError, match="'vau'"):
df.groupby("var").apply(
lambda rows: pd.DataFrame(
{"var": [rows.iloc[-1]["var"]], "val": [rows.iloc[-1]["vau"]]}
)
)