无法启动 jupyter 笔记本：TypeError

运行命令时jupyter notebook，我收到以下错误：

Traceback (most recent call last):
  File "/usr/local/bin/jupyter-notebook", line 6, in <module>
    from notebook.notebookapp import main
  File "/usr/local/lib/python3.5/dist-packages/notebook/notebookapp.py", line 47, in <module>
    from zmq.eventloop import ioloop
  File "/usr/local/lib/python3.5/dist-packages/zmq/eventloop/__init__.py", line 3, in <module>
    from zmq.eventloop.ioloop import IOLoop
  File "/usr/local/lib/python3.5/dist-packages/zmq/eventloop/ioloop.py", line 21, in <module>
    from tornado import ioloop
  File "/usr/local/lib/python3.5/dist-packages/tornado/ioloop.py", line 45, in <module>
    from tornado.concurrent import (
  File "/usr/local/lib/python3.5/dist-packages/tornado/concurrent.py", line 175, in <module>
    future: Union["futures.Future[_T]", "Future[_T]"], value: _T
  File "/usr/lib/python3.5/typing.py", line 552, in __getitem__
    dict(self.__dict__), parameters, _root=True)
  File "/usr/lib/python3.5/typing.py", line 512, in __new__
    for t2 in all_params - {t1} if not isinstance(t2, TypeVar)):
  File "/usr/lib/python3.5/typing.py", line 512, in <genexpr>
    for t2 in all_params - {t1} if not isinstance(t2, TypeVar)):
  File "/usr/lib/python3.5/typing.py", line 190, in __subclasscheck__
    self._eval_type(globalns, localns)
  File "/usr/lib/python3.5/typing.py", line 177, in _eval_type
    eval(self.__forward_code__, globalns, localns),
  File "<string>", line 1, in <module>
TypeError: 'type' object is not subscriptable

我没有使用 Anaconda。清理 python 3.5.2 和 pip3。

有谁知道问题是什么？

降级到tornado 5.1.1 将解决该问题。 当你使用 pip3 时

sudo pip3 uninstall tornado
sudo pip3 install tornado==5.1.1