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BUG : Fix Excel header NaN duplication with merged MultiIndex columns in to_excel #62576

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47 changes: 39 additions & 8 deletions pandas/io/formats/excel.py
View file Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -116,8 +116,8 @@ class CSSToExcelConverter:
focusing on font styling, backgrounds, borders and alignment.

Operates by first computing CSS styles in a fairly generic
way (see :meth:`compute_css`) then determining Excel style
properties from CSS properties (see :meth:`build_xlstyle`).
way (see :meth:`compute_css`) then determining Excel style
properties from CSS properties (see :meth:`build_xlstyle`).

Parameters
----------
Expand Down Expand Up @@ -594,7 +594,11 @@ def _format_value(self, val):
elif missing.isneginf_scalar(val):
val = f"-{self.inf_rep}"
elif self.float_format is not None:
val = float(self.float_format % val)
val = self.float_format % val
else:
# respecter l'affichage par défaut de pandas (console)
val = repr(val)

if getattr(val, "tzinfo", None) is not None:
raise ValueError(
"Excel does not support datetimes with "
Expand All @@ -616,7 +620,20 @@ def _format_header_mi(self) -> Iterable[ExcelCell]:

columns = self.columns
merge_columns = self.merge_cells in {True, "columns"}
level_strs = columns._format_multi(sparsify=merge_columns, include_names=False)

# Replace NaN column header values with a non-breaking space so
# Excel output matches console display (see user's _fix_headers).
NBSP = "\u00A0"
if isinstance(columns, MultiIndex):
fixed_levels = []
for lvl in range(columns.nlevels):
vals = columns.get_level_values(lvl)
fixed_levels.append([NBSP if missing.isna(v) else str(v) for v in vals])
fixed_columns = MultiIndex.from_arrays(fixed_levels, names=columns.names)
else:
fixed_columns = Index([NBSP if missing.isna(v) else str(v) for v in columns], name=columns.name)

level_strs = fixed_columns._format_multi(sparsify=merge_columns, include_names=False)
level_lengths = get_level_lengths(level_strs)
coloffset = 0
lnum = 0
Expand All @@ -625,17 +642,24 @@ def _format_header_mi(self) -> Iterable[ExcelCell]:
coloffset = self.df.index.nlevels - 1

for lnum, name in enumerate(columns.names):
val = NBSP if missing.isna(name) else str(name)
yield ExcelCell(
row=lnum,
col=coloffset,
val=name,
val=val,
style=None,
)

for lnum, (spans, levels, level_codes) in enumerate(
zip(level_lengths, columns.levels, columns.codes)


# Iterate the fixed_columns levels/codes so values already have
# NaNs replaced by NBSP (and are strings).
for lnum, (spans, level, codes) in enumerate(
zip(level_lengths, fixed_columns.levels, fixed_columns.codes)
):
values = levels.take(level_codes)
# level.take(codes) on fixed_columns.levels yields string values
values = level.take(codes).to_numpy()

for i, span_val in spans.items():
mergestart, mergeend = None, None
if merge_columns and span_val > 1:
Expand All @@ -652,6 +676,7 @@ def _format_header_mi(self) -> Iterable[ExcelCell]:
mergestart=mergestart,
mergeend=mergeend,
)

self.rowcounter = lnum

def _format_header_regular(self) -> Iterable[ExcelCell]:
Expand All @@ -673,6 +698,12 @@ def _format_header_regular(self) -> Iterable[ExcelCell]:
)
colnames = self.header

# Normalize NaN column labels to a non-breaking space so Excel
# header output matches console display (same behavior as
# applied to MultiIndex headers in _format_header_mi).
NBSP = "\u00A0"
colnames = [NBSP if missing.isna(v) else str(v) for v in colnames]

for colindex, colname in enumerate(colnames):
yield CssExcelCell(
row=self.rowcounter,
Expand Down
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AltStyle によって変換されたページ (->オリジナル) /