将 Python 版本从 3.5 升级到 3.6 后,Anaconda 无法打开

将 Python 版本从 3.5 升级到 3.6 后,Anaconda 无法打开

有人可以帮我摆脱这个错误吗?

jupyter-notebook这是我使用命令将 Python 3.5 升级到 3.6 后在终端中 输入时显示的错误:conda install python=3.6

Traceback (most recent call last):
     File "/usr/local/anaconda3/bin/jupyter-notebook", line 7, in <module>
from notebook.notebookapp import main

     File "/usr/local/anaconda3/lib/python3.6/site-packages/notebook/notebookapp.py", line 45, in <module>
     ioloop.install()

     File "/usr/local/anaconda3/lib/python3.6/site-packages/zmq/eventloop/ioloop.py", line 210, in install
assert (not ioloop.IOLoop.initialized()) or \

     AttributeError: type object 'IOLoop' has no attribute 'initialized'

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