OpenCV bindings for Python 3 not installed

[laclouis5]

I installed OpenCV 4.5.2 via this script on a fresh Jetson Nano and checked the installation with the procedure described in this issue. This was working properly, Cuda was enabled and OpenCV version was 4.5.2 both using command opencv_version and in a Python 3 interpreter.

However, I restarted the Jetson Nano and now in a Python 3 interpreter I got version 4.1.1. If I open an interpreter in sudo mode it still shows version 4.5.2.

Do you know the cause of this issue? However, solving the issue does not seem hard, I guess that copying the system Python cv2 shared library to the local Python dist-package folder should do the trick.

[laclouis5]

Ok, this did the trick:

sudo cp /usr/local/lib/python3.6/dist-packages/cv2/python-3.6/*.so /usr/lib/python3.6/dist-packages/cv2/python-3.6/

[mdegans]

Thanks for spotting this. I'd consider it still an open issue. Looks like it might be a good idea to purge any existing opencv before installing since it'll likely use the old version.

[mdegans]

Jsut a fyi, to anybody experiencing this, the above fix will work, but removing these apt package will also do the trick and possibly avoid other issues:

libopencv          libopencv-dev      libopencv-python   libopencv-samples

so sudo apt purge or sudo apt remove those and you should be fine.

[Randy37773]

unfortunately this does not the trick for me.
build_opencv.sh runs without errors (4.4 and 4.5.5), but cuda-support is only available in python2.7 not in python3.6.

sudo cp /usr/local/lib/python3.6/dist-packages/cv2/python-3.6/*.so /usr/lib/python3.6/dist-packages/cv2/python-3.6/

[tsubasa9647]

@Randy37773
I was able to resolve the issue by running the script below.
sudo cp /usr/local/lib/python3.6/site-packages/cv2/python-3.8/*.so /usr/lib/python3.8/dist-packages/cv2/python-3.8/

[IraeMare]

Solve it for me:
ln -s /usr/local/lib/python3.6/site-packages/cv2/python-3.6/cv2.cpython-36m-aarch64-linux-gnu.so cv2.so

UPD:
export PYTHONPATH=$PYTHONPATH:/usr/local/lib/python3.6/site-packages