C:\Users\ASUS>pip install opencv-python
Requirement already satisfied: opencv-python in e:\anaconda3\lib\site-packages (4.5.4.58)
Requirement already satisfied: numpy>=1.17.3 in e:\anaconda3\lib\site-packages (from opencv-python) (1.20.1)
你这个已经安装好了 cmd--> pip list 查看安装的库
表示opencv-python已经安装了，anaconda下安装的。
你的numpy版本太低了要升级到1.20.1