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BUG: Clarify KeyError for missing groups in GroupBy.get_group #63868

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BUG: Clarify KeyError for missing groups in GroupBy.get_group #63868

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4 changes: 2 additions & 2 deletions pandas/core/groupby/groupby.py
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Original file line number Diff line number Diff line change
Expand Up @@ -882,11 +882,11 @@ def get_group(self, name) -> DataFrame | Series:
if isinstance(name, tuple) and len(name) == 1:
name = name[0]
else:
raise KeyError(name)
raise KeyError(f"Group {name} not found")

inds = self._get_index(name)
if not len(inds):
raise KeyError(name)
raise KeyError(f"Group {name} not found")
return self._selected_obj.iloc[inds]

@final
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7 changes: 7 additions & 0 deletions pandas/tests/groupby/test_groupby.py
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Expand Up @@ -2887,6 +2887,13 @@ def test_get_group_len_1_list_likes(test_series, kwarg, value, name, warn):
tm.assert_equal(result, expected)


def test_get_group_missing_group_error_message():
df = DataFrame({"a": [1, 2], "b": [3, 4]})

with pytest.raises(KeyError, match="Group 3 not found"):
df.groupby("a").get_group(3)


def test_groupby_ngroup_with_nan():
# GH#50100
df = DataFrame({"a": Categorical([np.nan]), "b": [1]})
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