问题：ModuleNotFoundError: No module named 'cv2'
错误原因：直接下载了这个包，显示错误
解决方法：安装CV2
pip install opencv-python （如果只用主模块，使用这个命令安装）
pip install opencv-contrib-python （如果需要用主模块和contrib模块，使用这个命令安装）
- ModuleNotFoundError module named 39 cv2modulenotfounderror module named 39 modulenotfounderror watchdog module named modulenotfounderror module kornia named module问题named cv2 modulenotfounderror packaging module named pytorch module named 39 modulenotfounderror module pandas named modulenotfounderror module infer named modulenotfounderror module named torch modulenotfounderror module lanms named