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BUG: GH14882 Incorrect index label displayed on MultiIndex DataFrame #14975

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BUG: GH14882 Incorrect index label displayed on MultiIndex DataFrame #14975

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2 changes: 2 additions & 0 deletions doc/source/whatsnew/v0.20.0.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -318,3 +318,5 @@ Bug Fixes
- Require at least 0.23 version of cython to avoid problems with character encodings (:issue:`14699`)
- Bug in converting object elements of array-like objects to unsigned 64-bit integers (:issue:`4471`)
- Bug in ``pd.pivot_table()`` where no error was raised when values argument was not in the columns (:issue:`14938`)
- Bug in HTML display with MultiIndex and truncation (:issue:`14882`)

21 changes: 18 additions & 3 deletions pandas/formats/format.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1248,16 +1248,25 @@ def _write_hierarchical_rows(self, fmt_values, indent):
# Insert ... row and adjust idx_values and
# level_lengths to take this into account.
ins_row = self.fmt.tr_row_num
inserted = False
for lnum, records in enumerate(level_lengths):
rec_new = {}
for tag, span in list(records.items()):
if tag >= ins_row:
rec_new[tag + 1] = span
elif tag + span > ins_row:
rec_new[tag] = span + 1
dot_row = list(idx_values[ins_row - 1])
dot_row[-1] = u('...')
idx_values.insert(ins_row, tuple(dot_row))

# GH 14882 - Make sure insertion done once
if not inserted:
dot_row = list(idx_values[ins_row - 1])
dot_row[-1] = u('...')
idx_values.insert(ins_row, tuple(dot_row))
inserted = True
else:
dot_row = list(idx_values[ins_row])
dot_row[inner_lvl - lnum] = u('...')
idx_values[ins_row] = tuple(dot_row)
else:
rec_new[tag] = span
# If ins_row lies between tags, all cols idx cols
Expand All @@ -1267,6 +1276,12 @@ def _write_hierarchical_rows(self, fmt_values, indent):
if lnum == 0:
idx_values.insert(ins_row, tuple(
[u('...')] * len(level_lengths)))

# GH 14882 - Place ... in correct level
elif inserted:
dot_row = list(idx_values[ins_row])
dot_row[inner_lvl - lnum] = u('...')
idx_values[ins_row] = tuple(dot_row)
level_lengths[lnum] = rec_new

level_lengths[inner_lvl][ins_row] = 1
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