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Mypy fails when isinstance is used with nptyping type #121

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nazikus opened this issue Jul 14, 2024 · 0 comments
Open

Mypy fails when isinstance is used with nptyping type #121

nazikus opened this issue Jul 14, 2024 · 0 comments

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@nazikus
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nazikus commented Jul 14, 2024

Basic example test.py:

import cv2
from nptyping import Float64, NDArray, Shape
Image = NDArray[Shape["H, W, 3"], Float64]
image = cv2.imread("image.png")
assert isinstance(image, Image)

Run:

> pip install -U opencv-python==4.10.0.84 nptyping==2.5.0 mypy==1.10.1
> mypy test.py
test.py:5: error: Parameterized generics cannot be used with class or instance checks  [misc]

How to use nptyping with opencv and isinstance() properly so mypy check is passed?

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