近期想升級下matplotlib又突然想不起來升級命令怎么打了，就先卸載，再安裝，以求達到升級目的：
pip uninstall matplotlib
pip install matplotlib
結果在安裝這一步遇到了問題，報錯：
ERROR: Cannot uninstall 'certifi'. It is a distutils installed project and thus we cannot accurately determine which files belong to it which would lead to only a partial uninstall.
最終在網上找到以下解決辦法：https://blog.csdn.net/weixin_42317507/article/details/104667146?utm_medium=distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-3.channel_param&depth_1-utm_source=distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-3.channel_param
步驟如下：
1、pip install --ignore-installed certifi
2、pip install matplotlib
不再報錯，完美解決。