Note: Previously reported in #570, probably very related to #676.

Expected behaviour

Pylint was previously able to inspect cv2 member existence with the extension-pkg-whitelist parameter.

Actual behaviour

For opencv-python-4.6.0.66 (including the latest 4.7.0.72), pylint cannot inspect the members.

Workarounds

1. Use older opencv-python version (e.g. 4.5.5.64)
2. Set the generated-members=cv2.* pylint option (Use import cv2, not from cv2 import ..., suggested in cv2 module members are not recognized pylint-dev/pylint#2426)

Steps to reproduce

On Windows 10, Python 3.8 64bit, using Pylint 2.11.1:

"""Test module test.py"""
from cv2 import getStructuringElement, MORPH_ELLIPSE

a = getStructuringElement(MORPH_ELLIPSE, (3, 3))

With opencv-python-4.5.5.64:

$ pylint test.py --extension-pkg-whitelist=cv2 --unsafe-load-any-extension=y

-------------------------------------------------------------------
Your code has been rated at 10.00/10 (previous run: 5.00/10, +5.00)

With opencv-python-4.6.0.66 and the latest 4.7.0.72.:

$ pylint test.py --extension-pkg-whitelist=cv2 --unsafe-load-any-extension=y
************* Module test
test.py:2:0: E0611: No name 'getStructuringElement' in module 'cv2' (no-name-in-module)
test.py:2:0: E0611: No name 'MORPH_ELLIPSE' in module 'cv2' (no-name-in-module)

----------------------------------------------------------------------
Your code has been rated at -40.00/10 (previous run: 10.00/10, -50.00)

Issue submission checklist

• This is not a generic OpenCV usage question (looking for help for coding, other usage questions, homework etc.)
• I have read the README of this repository and understand that this repository provides only an automated build toolchain for OpenCV Python packages (there is no actual OpenCV code here)
• The issue is related to the build scripts in this repository, to the pre-built binaries or is a feature request (such as "please enable this additional dependency")
• I'm using the latest version of opencv-python