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ENH: Update DataFrame.to_stata to handle pd.NA and None values in strL columns #61286

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Apr 22, 2025
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ENH: Update DataFrame.to_stata to handle pd.NA and None values in strL columns #61286

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587e5d7
ENH: Update DataFrame.to_stata to handle pd.NA and None values in str…
Apr 14, 2025
92ed281
Update pandas/io/stata.py
Danferno Apr 22, 2025
11266a4
Moved changelog msg to 3.0.0 and adapted phrasing
Apr 22, 2025
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1 change: 1 addition & 0 deletions doc/source/whatsnew/v2.3.0.rst
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Expand Up @@ -150,6 +150,7 @@ MultiIndex
I/O
^^^
- :meth:`DataFrame.to_excel` was storing decimals as strings instead of numbers (:issue:`49598`)
- :meth:`DataFrame.to_stata` no longer throws a ``TypeError('encoding without a string argument')`` when exporting a column containing both long strings (Stata strL) and :class:`pd.NA` values (:issue:`23633`)
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Can you move this to v3.0.0.rst?

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Done, thanks

-

Period
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4 changes: 2 additions & 2 deletions pandas/io/stata.py
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Expand Up @@ -3196,8 +3196,8 @@ def generate_table(self) -> tuple[dict[str, tuple[int, int]], DataFrame]:
for o, (idx, row) in enumerate(selected.iterrows()):
for j, (col, v) in enumerate(col_index):
val = row[col]
# Allow columns with mixed str and None (GH 23633)
val = "" if val is None else val
# Allow columns with mixed str and None or pd.NA (GH 23633)
val = "" if (val is None) or isna(val) else val
key = gso_table.get(val, None)
if key is None:
# Stata prefers human numbers
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14 changes: 14 additions & 0 deletions pandas/tests/io/test_stata.py
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Expand Up @@ -2587,3 +2587,17 @@ def test_many_strl(temp_file, version):
lbls = ["".join(v) for v in itertools.product(*([string.ascii_letters] * 3))]
value_labels = {"col": {i: lbls[i] for i in range(n)}}
df.to_stata(temp_file, value_labels=value_labels, version=version)


@pytest.mark.parametrize("version", [117, 118, 119, None])
def test_strl_missings(temp_file, version):
# GH 23633
# Check that strl supports None and pd.NA
df = DataFrame(
[
{"str1": "string" * 500, "number": 0},
{"str1": None, "number": 1},
{"str1": pd.NA, "number": 1},
]
)
df.to_stata(temp_file, version=version)
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