用requirements.txt文件安装依赖时，出现错误，已经安装了PyYAML==5.3.1，无法卸载。
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.
强制安装，仍然无法通过requirements.txt，在网上找到解决办法。
输入以下命令，找出PyYAML的所有相关文件，删除掉
find / -name *PyYAML*
删掉Anaconda里面的。然后正常安装PyYAML即可。
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