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Fix to_excel not rendering None values in MultiIndex #51824

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Fix to_excel not rendering None values in MultiIndex #51824

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c5701b8
Fix to_excel not respecting None values in MultiIndex
mkflg Mar 5, 2023
7f31e40
Merge branch 'main' into issue-51252-nan-values-multiindex
mkflg Mar 13, 2023
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4 changes: 3 additions & 1 deletion pandas/io/formats/excel.py
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Original file line number Diff line number Diff line change
Expand Up @@ -647,7 +647,9 @@ def _format_header_mi(self) -> Iterable[ExcelCell]:
for lnum, (spans, levels, level_codes) in enumerate(
zip(level_lengths, columns.levels, columns.codes)
):
values = levels.take(level_codes)
values = levels.take(
level_codes, fill_value=self.na_rep if -1 in level_codes else None
)
for i, span_val in spans.items():
mergestart, mergeend = None, None
if span_val > 1:
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22 changes: 22 additions & 0 deletions pandas/tests/io/excel/test_writers.py
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Expand Up @@ -792,6 +792,28 @@ def test_to_excel_multiindex_cols(self, merge_cells, frame, path):
frame.columns = [".".join(map(str, q)) for q in zip(*fm)]
tm.assert_frame_equal(frame, df)

@pytest.mark.xfail(reason="na_values aren't applied to Index")
def test_to_excel_multiindex_nan_level(self, frame, path):
"""
Tests https://github.com/pandas-dev/pandas/issues/51252
"""
cols_index = MultiIndex.from_tuples(
[
("Item", "Type 1", "Class A"),
("Item", "Type 1", "Class B"),
("Item", "Type 2", "Class A"),
("Item", "Type 2", "Class B"),
("Item", "Type 3", None),
]
)
df = pd.DataFrame(np.random.randn(10, 5), columns=cols_index)
df.to_excel(path, "test1")
with ExcelFile(path) as reader:
df2 = pd.read_excel(
reader, sheet_name="test1", header=[0, 1, 2], index_col=[0]
)
tm.assert_frame_equal(df, df2)

def test_to_excel_multiindex_dates(self, merge_cells, tsframe, path):
# try multiindex with dates
new_index = [tsframe.index, np.arange(len(tsframe.index), dtype=np.int64)]
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