1.安装包的时候出现的问题
2.试了好多方法，终于
pip3 install -r requirements.txt -i https://mirrors.aliyun.com/pypi/simple/ --ignore-installed
安装成功
Python ERROR: Cannot uninstall 'PyYAML'. 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.
原文：https://www.cnblogs.com/mke2fs/p/12310663.html
