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[2.3.x] COMPAT: fix construct_1d_object_array_from_listlike for older numpy #60558

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Merged
merged 1 commit into from
Dec 13, 2024
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[2.3.x] COMPAT: fix construct_1d_object_array_from_listlike for older numpy #60558

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5 changes: 4 additions & 1 deletion pandas/core/dtypes/cast.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1606,7 +1606,10 @@ def construct_1d_object_array_from_listlike(values: Collection) -> np.ndarray:
"""
# numpy will try to interpret nested lists as further dimensions in np.array(),
# hence explicitly making a 1D array using np.fromiter
return np.fromiter(values, dtype="object", count=len(values))
result = np.empty(len(values), dtype="object")
for i, obj in enumerate(values):
result[i] = obj
return result


def maybe_cast_to_integer_array(arr: list | np.ndarray, dtype: np.dtype) -> np.ndarray:
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