jupyter和tornado版本不匹配

安装anaconda后jupyter notebook打开显示tornado版本不匹配。

(base) C:\WINDOWS\system32>jupyter notebook
Traceback (most recent call last):
  File "D:\Anaconda3\Scripts\jupyter-notebook-script.py", line 6, in <module>
    from notebook.notebookapp import main
  File "D:\Anaconda3\lib\site-packages\notebook\notebookapp.py", line 58, in <module>
    raise ImportError(_("The Jupyter Notebook requires tornado >= 5.0, but you have %s") % tornado.version)
ImportError: The Jupyter Notebook requires tornado >= 5.0, but you have 4.5.3

在Anaconda终端升级下tornado 版本再打开看看：

conda install tornado==5.0