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.

使用pip在Ubuntu上安装tfx（TensorFlow extended）:

pip install -q tfx==0.15.0rc0

报错：

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.

大概意思是不能卸载PyYAML。

找了一下原因：

从pip 10开始就不支持卸载distutils的包了，查看GitHub上的issue。

解决方案：

在命令上添加

pip install -q tfx==0.15.0rc0 --ignore-installed

参考：

https://stackoverflow.com/questions/49911550/how-to-upgrade-disutils-package-pyyaml