Collecting cv2 Could not find a version that satisfies the requirement cv2 (from versions: )

安装cv2报错：

Collecting cv2 Could not find a version that satisfies the requirement cv2 (from versions: ) No matching distribution found for cv2

Pycharm/Python OpenCV and CV2 install error

原因：

知道原因是真的是哭笑不得，因为原因是CV2在的软件包不叫从cv2而是叫opencv-python

pip install opencv-python

对于python3：

pip3 install opencv-python

也可以在pycharm里直接找opencv-python，安装。