BUG: Printing of MultiIndex fails for longer strings

[hagenw]

Pandas version checks

• I have checked that this issue has not already been reported.

• I have confirmed this bug exists on the latest version of pandas.

• I have confirmed this bug exists on the main branch of pandas.

Reproducible Example

import pandas as pd

# Short string, works when printing
index = pd.MultiIndex.from_arrays((['a' * 10], [0.1], [0.9]), names=['file', 'start', 'end'])
print(index)

# Long string, fails when printing
index = pd.MultiIndex.from_arrays((['a' * 58], [0.1], [0.9]), names=['file', 'start', 'end'])
print(index)

Issue Description

The last print statement fails with:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/audeering.local/hwierstorf/.envs/test/lib/python3.8/site-packages/pandas/core/indexes/base.py", line 1233, in __repr__
    data = self._format_data()
  File "/home/audeering.local/hwierstorf/.envs/test/lib/python3.8/site-packages/pandas/core/indexes/base.py", line 1275, in _format_data
    return format_object_summary(
  File "/home/audeering.local/hwierstorf/.envs/test/lib/python3.8/site-packages/pandas/io/formats/printing.py", line 440, in format_object_summary
    summary, line = _extend_line(summary, line, tail[-1], display_width - 2, space2)
  File "/home/audeering.local/hwierstorf/.envs/test/lib/python3.8/site-packages/pandas/io/formats/printing.py", line 355, in _extend_line
    if adj.len(line.rstrip()) + adj.len(value.rstrip()) >= display_width:
AttributeError: 'tuple' object has no attribute 'rstrip'

Expected Behavior

It should have returned something like:

MultiIndex([('aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa', ...)],
           names=['file', 'start', 'end'])

Installed Versions

INSTALLED VERSIONS

commit : 965ceca
python : 3.8.16.final.0
python-bits : 64
OS : Linux
OS-release : 5.4.0-149-generic
Version : #166~18.04.1-Ubuntu SMP Fri Apr 21 16:42:44 UTC 2023
machine : x86_64
processor : x86_64
byteorder : little
LC_ALL : None
LANG : en_GB.UTF-8
LOCALE : en_GB.UTF-8

pandas : 2.0.2
numpy : 1.24.3
pytz : 2023.3
dateutil : 2.8.2
setuptools : 67.7.2
pip : 23.1.2
Cython : None
pytest : None
hypothesis : None
sphinx : None
blosc : None
feather : None
xlsxwriter : None
lxml.etree : None
html5lib : None
pymysql : None
psycopg2 : None
jinja2 : None
IPython : None
pandas_datareader: None
bs4 : None
bottleneck : None
brotli : None
fastparquet : None
fsspec : None
gcsfs : None
matplotlib : None
numba : None
numexpr : None
odfpy : None
openpyxl : None
pandas_gbq : None
pyarrow : None
pyreadstat : None
pyxlsb : None
s3fs : None
scipy : None
snappy : None
sqlalchemy : None
tables : None
tabulate : None
xarray : None
xlrd : None
zstandard : None
tzdata : 2023.3
qtpy : None
pyqt5 : None

[hagenw]

When trying to replicate this on the main branch of pandas import of pandas fails for me after installing it with python setup.py install:

>>> import pandas as pd
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/audeering.local/hwierstorf/git/pandas/pandas/__init__.py", line 46, in <module>
    from pandas.core.api import (
  File "/home/audeering.local/hwierstorf/git/pandas/pandas/core/api.py", line 28, in <module>
    from pandas.core.arrays import Categorical
  File "/home/audeering.local/hwierstorf/git/pandas/pandas/core/arrays/__init__.py", line 12, in <module>
    from pandas.core.arrays.interval import IntervalArray
  File "/home/audeering.local/hwierstorf/git/pandas/pandas/core/arrays/interval.py", line 89, in <module>
    from pandas.core.arrays.timedeltas import TimedeltaArray
  File "/home/audeering.local/hwierstorf/git/pandas/pandas/core/arrays/timedeltas.py", line 33, in <module>
    from pandas._libs.tslibs.fields import (
ImportError: cannot import name 'get_timedelta_days' from 'pandas._libs.tslibs.fields' (/home/audeering.local/hwierstorf/git/pandas/pandas/_libs/tslibs/fields.cpython-38-x86_64-linux-gnu.so)

[Charlie-XIAO]

@hagenw This bug does exist in the 2.0.2 release, but has been fixed in #53004. Now on the main branch, the output of your example would be

MultiIndex([('aaaaaaaaaa', 0.1, 0.9)],
           names=['file', 'start', 'end'])
MultiIndex([('aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa', ...)],
           names=['file', 'start', 'end'])

as expected.

[mroeschke]

Yeah since this is fixed on main and it is tested going to close.

[hagenw]

Cool, thanks for fixing.

[hagenw]

This issue should have been fixed with pandas 2.0.3, but it isn't for me:

>>> import pandas as pd

>>> pd.__version__
'2.0.3'

>>> index = pd.MultiIndex.from_arrays((['a' * 58], [0.1], [0.9]), names=['file', 'start', 'end'])

>>> print(index)
---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
Cell In[11], line 1
----> 1 print(index)

File ~/.envs/analysis/lib/python3.8/site-packages/pandas/core/indexes/base.py:1233, in Index.__repr__(self)
   1229 """
   1230 Return a string representation for this object.
   1231 """
   1232 klass_name = type(self).__name__
-> 1233 data = self._format_data()
   1234 attrs = self._format_attrs()
   1235 space = self._format_space()

File ~/.envs/analysis/lib/python3.8/site-packages/pandas/core/indexes/base.py:1275, in Index._format_data(self, name)
   1272     if is_object_dtype(self.categories):
   1273         is_justify = False
-> 1275 return format_object_summary(
   1276     self,
   1277     self._formatter_func,
   1278     is_justify=is_justify,
   1279     name=name,
   1280     line_break_each_value=self._is_multi,
   1281 )

File ~/.envs/analysis/lib/python3.8/site-packages/pandas/io/formats/printing.py:440, in format_object_summary(obj, formatter, is_justify, name, indent_for_name, line_break_each_value)
    437     summary, line = _extend_line(summary, line, word, display_width, space2)
    439 # last value: no sep added + 1 space of width used for trailing ','
--> 440 summary, line = _extend_line(summary, line, tail[-1], display_width - 2, space2)
    441 summary += line
    443 # right now close is either '' or ', '
    444 # Now we want to include the ']', but not the maybe space.

File ~/.envs/analysis/lib/python3.8/site-packages/pandas/io/formats/printing.py:355, in format_object_summary.<locals>._extend_line(s, line, value, display_width, next_line_prefix)
    352 def _extend_line(
    353     s: str, line: str, value: str, display_width: int, next_line_prefix: str
    354 ) -> tuple[str, str]:
--> 355     if adj.len(line.rstrip()) + adj.len(value.rstrip()) >= display_width:
    356         s += line.rstrip()
    357         line = next_line_prefix

AttributeError: 'tuple' object has no attribute 'rstrip'

[Charlie-XIAO]

I think it is for 2.1.0.

[hagenw]

Ah, this might be true. I just assumed that "being fixed in main" would include it automatically in the next release.