安裝Python的cv2包出錯

當在命令行輸入pip install cv2時報錯如下：

ERROR: Could not find a version that satisfies the requirement cv2 (from versions: none)
ERROR: No matching distribution found for cv2

原因就是cv2的包不叫cv2，而是叫opencv-python
所以當輸入pip install opencv-python時， 即可正確安裝。