8000 TYP: array.tolist() returns a list of strings · Issue #28240 · numpy/numpy · GitHub
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TYP: array.tolist() returns a list of strings #28240

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b-kamphorst opened this issue Jan 28, 2025 · 1 comment
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TYP: array.tolist() returns a list of strings #28240

b-kamphorst opened this issue Jan 28, 2025 · 1 comment
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41 - Static typing

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@b-kamphorst
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Describe the issue:

Mypy believes that the array.tolist() method returns (a nested) list of strings, even if the array is filled with other objects such as integers.

Reproduce the code example:

import numpy as np


def main() -> None:
    arr = np.array([1, 2])
    arr2: list[int] = arr.tolist()

Error message:

test.py: note: In function "main":
test.py:7: error: Incompatible types in assignment (expression has type "str | list[str] | list[list[str]] | list[list[list[Any]]]", variable has type "list[int]")  [assignment]

Python and NumPy Versions:

numpy: 2.2.2
Python: 3.12.2 (main, Oct 17 2024, 10:53:28) [GCC 11.4.0]

Type-checker version and settings:

mypy 1.11.2 (compiled: yes)

Additional typing packages.

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@jorenham
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duplicate of #27944

@jorenham jorenham mentioned this issue Feb 9, 2025
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