问题描述：

WARNING: You are using pip version 20.0.2; however, version 20.1 is available.
You should consider upgrading via the 'C:\Users\大大文\AppData\Local\Programs\Python\Python38\python.exe -m pip install --upgrade pip' command.

解决方案：

输入pip install --user --upgrade pip升级失败的，试这条命令： python -m pip install --upgrade pip -i https://pypi.douban/simple