例如想要升级nibabel时
使用命令：sudo pip install --upgrade nibabel
报错：
Cannot uninstall ‘nibabel’. 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.
问题解析：
旧版本依赖多，不能清晰的删除，此时应该忽略旧版本升级，即如下
加上 --ignore-installed
解决办法：sudo pip install nibabel --ignore-installed nibabel