pip3版本已经是最新，安装openxl失败，Could not find a version that satisfies the requirement openxl

pip3版本已经是最新，安装openxl失败，提示 Could not find a version that satisfies the requirement openxl，No matching distribution found for openxl

用以下问答中的第3个答案解决，其他两种应该也没问题。

https://ask.csdn.net/questions/1053770