Breaking changes in module loading v4.6.0.66

[M3ssman]

Expected behaviour

With opencv-python-headless-4.5.5.64 I was able to import opencv module into Python alike:

from cv2 import (
     cv2
)

this way any related functionalities could be accessed, for example via cv2.putText.

Actual behavior

Since yesterday, opencv-python-headless-4.6.0.66 gets pulled.
Any automated build pipelines now break with the error

$ pytest --cov=lib tests/ -v
ImportError while loading conftest '/home/gitlab-runner/builds/QWycMLvj/0/ulb/ulb-it-migration/tests/conftest.py'.
tests/conftest.py:15: in <module>
    from cv2 import (
E   ImportError: Bindings generation error. Submodule name should always start with a parent module name. Parent name: cv2.cv2. Submodule name: cv2

Steps to reproduce

• example code: please see above
• ubuntu 20.04 LTS
• x86
• opencv-python-headless-4.6.0.66

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

[M3ssman]

Any suggestions welcome!

[VadimLevin]

Good day, why do you try to import the internal implementation module instead of the using cv2 module directly: import cv2?

$ python3 --version
Python 3.9.12
$ python3 -m venv venv
$ source venv/bin/activate
$ pip install opencv-python-headless==4.6.0.66
$ python -c "import cv2; print(cv2.__version__)"
4.6.0
$ python -c "import cv2; print(cv2.putText)"
<built-in function putText>

it is the same thing to do the following: from csv import _csv internal implementation - it is not possible and raises the error.

[BenLin0]

I don't know how the cv2 is organized, by when you use

Good day, why do you try to import the internal implementation module instead of the using cv2 module directly: import cv2?

$ python3 --version
Python 3.9.12
$ python3 -m venv venv
$ source venv/bin/activate
$ pip install opencv-python-headless==4.6.0.66
$ python -c "import cv2; print(cv2.__version__)"
4.6.0
$ python -c "import cv2; print(cv2.putText)"
<built-in function putText>

it is the same thing to do the following: from csv import _csv internal implementation - it is not possible and raises the error.

I don't know how the cv2 is organized, but when you use "import cv2", the PyCharm (and pylint) is not able to detect the members of cv2 , so it is giving warning for any operation of cv2. The solution is to use 'from cv2 import cv2' at the beginning of the code.

Looks like the new version (4.6.066) changes the packaging of cv2, making 'from cv2 import cv2' no longer valid.

[gregorybchris]

Chiming in to improve searchability!
I'm getting new pylint errors as of the June 8 version 4.6.0.66 release:

No name 'VideoCapture' in module 'cv2' (no-name-in-module)

I have allow-listed cv2 as an extension package and still get a pylint error with the new version:

[tool.pylint.master]
extension-pkg-allow-list = ["cv2"]

This issue was not present in opencv-python-headless version 4.5.5.64. I'll downgrade to 4.5.5.64 until the fix is released. Thanks!

[semaphore-egg]

Another pycharm user has to pin the version to 4.5.5.64

[asmorkalov]

Potentially related: #689

[kevinlinxc]

This issue is also bothering me