System Information

OpenCV python: opencv-python-headless==4.8.0.74
Operating System / Platform: 10.0.19045 Build 19045
Python version: 3.9.13

Detailed description

Class cv2.error is currently typed as:

class error(Exception): ...

but should be something like:

class error(Exception):
    code: int
    err: str
    file: str
    func: str
    line: int
    msg: str

(They are technically ClassVars, but would be None)

As inspected with:

>>> import cv2
>>> error_dir = dir(cv2.error)
>>> exception_dir = dir(Exception)
>>> [x for x in error_dir if x not in exception_dir]
['__module__', '__weakref__', 'code', 'err', 'file', 'func', 'line', 'msg']

>>> try:
...   cv2.VideoCapture().read("aaa")
... except cv2.error as error:
...   print(type(error.code), type(error.err), type(error.file), type(error.func), type(error.line), type(error.msg))
...
<class 'int'> <class 'str'> <class 'str'> <class 'str'> <class 'int'> <class 'str'>

Steps to reproduce

Actual usage example:

Issue submission checklist

• I report the issue, it's not a question
• I checked the problem with documentation, FAQ, open issues, forum.opencv.org, Stack Overflow, etc and have not found any solution
• I updated to the latest OpenCV version and the issue is still there
• There is reproducer code and related data files (videos, images, onnx, etc)