如何安装Jupyter解决错误？

Question

我是python的新手，我尝试使用此命令安装jupyter

sudo pip install jupyter

但是得到了

Found existing installation: tornado 3.1.1
Cannot uninstall 'tornado'. 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.

我知道龙卷风有多个版本，但无法解决

感谢您的帮助

Answer 1

执行pip uninstall tornado 接着 做pip install tornado==4.0.0