问题
I installed Miniconda and I'm trying to use Jupyter Notebook with it but haven't been able to do so. After installing miniconda I ran the jupyter notebook command on my terminal and jupyter wasn't installed.
I went ahead and installed it with the conda install jupyter. However, I once again ran jupyter notebook on my terminal and got the following console error:
Emilios-MacBook-Pro:documents emilioramirezeguia$ jupyter notebook Traceback (most recent call last): File "/Users/emilioramirezeguia/miniconda2/bin/jupyter-notebook", line 7, in from notebook.notebookapp import main File "/Users/emilioramirezeguia/miniconda2/lib/python2.7/site-packages/notebook/notebookapp.py", line 45, in ioloop.install() File "/Users/emilioramirezeguia/miniconda2/lib/python2.7/site-packages/zmq/eventloop/ioloop.py", line 210, in install assert (not ioloop.IOLoop.initialized()) or \ AttributeError: type object 'IOLoop' has no attribute 'initialized'
Any idea how to fix this?
Thank you
回答1:
This problem has just happened to me as well. My older anaconda environments seem to be working fine but the environments I have created today seem to have this exact issue which throws AttributeError: type object 'IOLoop' has no attribute 'initialized'.
It seems to be because of the latest release of tornado==5.0 which released either today or yesterday. I reverted back to the last stable version i.e. tornado==4.5.3 and it worked.
Here's the solution
pip uninstall tornado
pip install tornado==4.5.3
回答2:
Miniconda is OK but Anaconda is recommend.
I have the same issue and thanks Nitred give the right solution.
It seems that jupyter notebook does not support the tornado 5.0. So downgrade as the following:
pip uninstall tornado
pip install tornado==4.5.3
回答3:
I needed matplotlib in python, and need jupyter working. The package will try to uninstall matplotlib if you uninstall tornado, unless you do a force. But I still need matplotlib, I need that. So I still need to force matplotlib to use the old version of tornado. Turns out I had two tornado versions, one installed by pip, other installed by conda.
Ultimately running these commands got jupyter and matplotlib working again: (Ran it in the conda environment that was broken.)
conda remove tornado --force # keeps matplotlib
pip uninstall tornado
conda install tornado=4.5.3
I earlier had used pip to install tensorflow library, which I also need, and maybe it brought along the junky tornado v5, not sure.
来源：https://stackoverflow.com/questions/49141525/install-jupyter-notebook-on-miniconda