LD_PRELOAD=/usr/lib/arm-linux-gnueabihf/libatomic.so.1.2.0 python open_cv.py code example

Example 1: from .cv2 import * ImportError: /home/pi/.local/lib/python3.7/site-packages/cv2/cv2.cpython-37m-arm-linux-gnueabihf.so: undefined symbol: __atomic_fetch_add_8

pip install opencv-contrib-python==3.4.3.18

Example 2: ImportError: /usr/local/lib/python3.7/dist-packages/cv2/cv2.cpython-37m-arm-linux-gnueabihf.so: undefined symbol: __atomic_fetch_add_8

sudo pip3 install opencv-contrib-python==3.4.6.27

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