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BUG: pivot_table with margins=T raises when results in empty df #49438

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Merged
mroeschke merged 8 commits into from
Nov 2, 2022
Merged

BUG: pivot_table with margins=T raises when results in empty df #49438

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c21d8de
BUG: pivot_table with margins=T raises when results in empty df
debnathshoham Nov 1, 2022
3763e8b
Merge branch 'main' into gh49240_pivottable_bug
debnathshoham Nov 1, 2022
b0c3d5e
suggested change
debnathshoham Nov 1, 2022
9386878
suggested change
debnathshoham Nov 1, 2022
4044172
Merge branch 'main' into gh49240_pivottable_bug
debnathshoham Nov 1, 2022
d982d61
Update pivot.py
debnathshoham Nov 1, 2022
79bf88f
linked test to issue
debnathshoham Nov 1, 2022
a579234
suggested edit
debnathshoham Nov 1, 2022
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2 changes: 1 addition & 1 deletion doc/source/whatsnew/v2.0.0.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -441,7 +441,7 @@ Reshaping
- Bug in :meth:`DataFrame.unstack` and :meth:`Series.unstack` unstacking wrong level of :class:`MultiIndex` when :class:`MultiIndex` has mixed names (:issue:`48763`)
- Bug in :meth:`DataFrame.pivot` not respecting ``None`` as column name (:issue:`48293`)
- Bug in :func:`join` when ``left_on`` or ``right_on`` is or includes a :class:`CategoricalIndex` incorrectly raising ``AttributeError`` (:issue:`48464`)
-
- Bug in :meth:`DataFrame.pivot_table` raising ``ValueError`` with parameter ``margins=True`` when result is an empty :class:`DataFrame` (:issue:`49240`)

Sparse
^^^^^^
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6 changes: 5 additions & 1 deletion pandas/core/reshape/pivot.py
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Expand Up @@ -411,7 +411,11 @@ def _all_key(key):
table_pieces.append(transformed_piece)
margin_keys.append(all_key)

result = concat(table_pieces, axis=cat_axis)
if not table_pieces:
# GH 49240
return table
else:
result = concat(table_pieces, axis=cat_axis)

if len(rows) == 0:
return result
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9 changes: 6 additions & 3 deletions pandas/tests/reshape/test_pivot.py
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Expand Up @@ -2086,8 +2086,9 @@ def test_pivot_table_aggfunc_scalar_dropna(self, dropna):

tm.assert_frame_equal(result, expected)

def test_pivot_table_empty_aggfunc(self):
# GH 9186 & GH 13483
@pytest.mark.parametrize("margins", [True, False])
def test_pivot_table_empty_aggfunc(self, margins):
# GH 9186 & GH 13483 & GH 49240
df = DataFrame(
{
"A": [2, 2, 3, 3, 2],
Expand All @@ -2096,7 +2097,9 @@ def test_pivot_table_empty_aggfunc(self):
"D": [None, None, None, None, None],
}
)
result = df.pivot_table(index="A", columns="D", values="id", aggfunc=np.size)
result = df.pivot_table(
index="A", columns="D", values="id", aggfunc=np.size, margins=margins
)
expected = DataFrame(index=Index([], dtype="int64", name="A"))
expected.columns.name = "D"
tm.assert_frame_equal(result, expected)
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