Jupyter 笔记本导入错误：没有名为 tornado.log 的模块

Question

I have installed jupyter and when trying to start it, I get the following error:

File "/Library/Frameworks/Python.framework/Versions/2.7/bin/jupyter-notebook", line 7, in <module>
from notebook.notebookapp import main
File"/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/notebook/__init__.py", line 25, in <module>
from .nbextensions import install_nbextension
File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/notebook/nbextensions.py", line 35, in <module>
from tornado.log import LogFormatter
ImportError: No module named tornado.log

I tried uninstalling and reinstalling jupyter, tornado, or anything I could somehow link to this error and nothing really helped. This actually used to work pretty well but it recently began throw the above error at me. Any help is greatly appreciated.

Answer 1

我只是通过强制重新安装 tornado 来解决这个问题，使用这个命令： pip2 install tornado --user --ignore-installed

Answer 2

Reinstalling tornado isn't the problem; the outdated version is. Upgrade with pip install --upgrade tornado .

Answer 3

I had this problem on linux and the cause of my grief was permissions related.

ie. jupyter notebook gave me this error.

sudo jupyter notebook worked.

Turned out some libs were owned by root. I must have done a sudo pip something at some stage.

The fix is to either run it as root or change the permissions on the libraries

I did a $ sudo chmod -R o+rx /usr/local/lib/python2.7

Answer 4

Try this:

pip install --upgrade tornado

It worked for me.