摘要：
From time to time, when you start Office 365 trial with Exchange Online license, after some time you happen to be cut off from email communication and 阅读全文
摘要：
首先排除环境变量设置问题 其次如果python安装pip后更改了目录，也会导致同样问题。解决方案：用python绝对路径重新安装pip F:\Python\Python38\python -m pip install --upgrade pip 强制重新安装： F:\Python\Python38\ 阅读全文