python卸载six包Cannot uninstall 'si

Cannot uninstall 'six'. 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.

错误原因:

[https://github.com/pypa/pip/issues/3165](https://github.com/pypa/pip/issues/3165)

解决方案:

sudo pip install six --upgrade --ignore-installed six