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BUG: MultiIndex displays incorrectly with a long element #53044

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Merged
merged 5 commits into from
May 5, 2023
Merged

BUG: MultiIndex displays incorrectly with a long element #53044

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131d8dc
if branch may not be visited, so head and tail may not be correctly set
Charlie-XIAO May 2, 2023
57973f4
Merge remote-tracking branch 'upstream/main' into fix-pprint-obj
Charlie-XIAO May 2, 2023
b8d0bfb
fixed pylint possibly undefined variable
Charlie-XIAO May 2, 2023
0528ad4
updated changelog
Charlie-XIAO May 4, 2023
6fad43f
added unit test
Charlie-XIAO May 4, 2023
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2 changes: 1 addition & 1 deletion doc/source/whatsnew/v2.1.0.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -372,7 +372,7 @@ I/O
- Bug in :func:`read_hdf` not properly closing store after a ``IndexError`` is raised (:issue:`52781`)
- Bug in :func:`read_html`, style elements were read into DataFrames (:issue:`52197`)
- Bug in :func:`read_html`, tail texts were removed together with elements containing ``display:none`` style (:issue:`51629`)
-
- Bug in displaying a :class:`MultiIndex` with a long element (:issue:`52960`)

Period
^^^^^^
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10 changes: 6 additions & 4 deletions pandas/io/formats/printing.py
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Expand Up @@ -412,12 +412,14 @@ def best_len(values: list[str]) -> int:
# max_space
max_space = display_width - len(space2)
value = tail[0]
for max_items in reversed(range(1, len(value) + 1)):
pprinted_seq = _pprint_seq(value, max_seq_items=max_items)
max_items = 1
for num_items in reversed(range(1, len(value) + 1)):
pprinted_seq = _pprint_seq(value, max_seq_items=num_items)
if len(pprinted_seq) < max_space:
head = [_pprint_seq(x, max_seq_items=max_items) for x in head]
tail = [_pprint_seq(x, max_seq_items=max_items) for x in tail]
max_items = num_items
break
head = [_pprint_seq(x, max_seq_items=max_items) for x in head]
tail = [_pprint_seq(x, max_seq_items=max_items) for x in tail]

summary = ""
line = space2
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11 changes: 11 additions & 0 deletions pandas/tests/io/formats/test_printing.py
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Expand Up @@ -196,3 +196,14 @@ def test_enable_data_resource_formatter(self, ip):
assert formatters[mimetype].enabled
# smoke test that it works
ip.instance(config=ip.config).display_formatter.format(cf)


def test_multiindex_long_element():
# Non-regression test towards GH #52960
data = pd.MultiIndex.from_tuples([("c" * 62,)])

expected = (
"MultiIndex([('cccccccccccccccccccccccccccccccccccccccc"
"cccccccccccccccccccccc',)],\n )"
)
assert str(data) == expected