AttributeError: module ‘cv2‘ has no attribute ‘face‘

- 1.pip uninstall opencv-python
 - 2.pip uninstall opencv-contrib-python
 - 3.pip install opencv-python
 - 4.pip install opencv-contrib-python
問題即可得到解決,面對pip下載下傳速度慢的問題,前邊的部落格有解決方案,可以使用清華的鏡像