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BUG: AttributeError: 'BooleanArray' object has no attribute 'sum' while infer types #44423

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BUG: AttributeError: 'BooleanArray' object has no attribute 'sum' while infer types #44423

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522ffa8
BUG GH44079 fix
zhangxiaoxing Nov 13, 2021
eb8d28b
BUG GH44079 pre-commit checked
zhangxiaoxing Nov 13, 2021
908389a
BUG GH44079 added test
zhangxiaoxing Nov 14, 2021
fa43054
BUG GH44079 typofix
zhangxiaoxing Nov 14, 2021
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2 changes: 1 addition & 1 deletion pandas/io/parsers/base_parser.py
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Original file line number Diff line number Diff line change
Expand Up @@ -698,7 +698,7 @@ def _infer_types(self, values, na_values, try_num_bool=True):
# error: Argument 2 to "isin" has incompatible type "List[Any]"; expected
# "Union[Union[ExtensionArray, ndarray], Index, Series]"
mask = algorithms.isin(values, list(na_values)) # type: ignore[arg-type]
na_count = mask.sum()
na_count = mask.astype("uint8").sum()
if na_count > 0:
if is_integer_dtype(values):
values = values.astype(np.float64)
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21 changes: 21 additions & 0 deletions pandas/tests/io/parser/test_index_col.py
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Expand Up @@ -297,3 +297,24 @@ def test_multiindex_columns_index_col_with_data(all_parsers):
index=Index(["data"]),
)
tm.assert_frame_equal(result, expected)


@skip_pyarrow
def test_infer_types_boolean_sum(all_parsers):
# GH#44079
parser = all_parsers
result = parser.read_csv(
StringIO("0,1"),
names=["a", "b"],
index_col=["a"],
dtype={"a": "UInt8"},
)
expected = DataFrame(
data={
"a": [
0,
],
"b": [1],
}
).set_index("a")
tm.assert_frame_equal(result, expected, check_index_type=False)