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BUG: repr aligning left for string dtype columns #54801

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Merged
merged 2 commits into from
Aug 28, 2023
Merged

BUG: repr aligning left for string dtype columns #54801

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19fd2b3
BUG: repr aligning left for string dtype columns
phofl Aug 28, 2023
a7b48c8
Update pandas/core/indexes/base.py
phofl Aug 28, 2023
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1 change: 1 addition & 0 deletions doc/source/whatsnew/v2.1.0.rst
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Expand Up @@ -717,6 +717,7 @@ Conversion
Strings
^^^^^^^
- Bug in :meth:`Series.str` that did not raise a ``TypeError`` when iterated (:issue:`54173`)
- Bug in ``repr`` for :class:`DataFrame`` with string-dtype columns (:issue:`54797`)

Interval
^^^^^^^^
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2 changes: 2 additions & 0 deletions pandas/core/indexes/base.py
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Expand Up @@ -1395,6 +1395,8 @@ def _format_with_header(self, header: list[str_t], na_rep: str_t) -> list[str_t]
from pandas.io.formats.format import format_array

values = self._values
if is_string_dtype(values.dtype):
values = np.asarray(values)
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Suggested change
if is_string_dtype(values.dtype):
values = np.asarray(values)
if is_string_dtype(values.dtype):
# ensure we have an object dtype numpy array
values = np.asarray(values)


if is_object_dtype(values.dtype):
values = cast(np.ndarray, values)
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11 changes: 11 additions & 0 deletions pandas/tests/frame/test_repr_info.py
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Expand Up @@ -455,3 +455,14 @@ def test_masked_ea_with_formatter(self):
0 0.12 1.00
1 1.12 2.00"""
assert result == expected

def test_repr_ea_columns(self, any_string_dtype):
# GH#54797
pytest.importorskip("pyarrow")
df = DataFrame({"long_column_name": [1, 2, 3], "col2": [4, 5, 6]})
df.columns = df.columns.astype(any_string_dtype)
expected = """ long_column_name col2
0 1 4
1 2 5
2 3 6"""
assert repr(df) == expected