错误：ERROR: Could not install packages due to an EnvironmentError: [WinError 5] 拒绝访问。: ‘D:\Anaconda3\Lib\site-packages\cv2\cv2.cp37-win_amd64.pyd’
Consider using the --user option or check the permissions.
改正：pip install --user -i https://pypi.tuna.tsinghua.edu.cn/simple opencv-contrib-python
加一个user
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