How to fix 'Install tornado itself to use zmq with the tornado IOLoop.' warning in Python

Question

I've been following this (https://developer.ibm.com/tutorials/se-distributed-apps-zeromq-part2/) tutorial for setting up a ZeroMQ client/server setup which uses CurveZMQ to encrypt messages. The code works, however whenever I run either the client or the server it instructs me to 'Install tornado itself to use zmq with the tornado IOLoop.'

I've found that the warning appears in any file with the following import statement.

from zmq.eventloop.zmqstream import ZMQStream

I've looked in the code for zmq and noticed that it uses "minitornado", which is likely the problem, but I don't know much about tornado or how to use it.

Dextrorse

Answer 1

You need to upgrade pyzmq. You can use this command to force your environment to reinstall updated version. (It worked for me!)

pip install --upgrade --force-reinstall pyzmq

Admeasure

Answer 2

I don't know if it's related to your problem. I googled about the same problem, but related to jupyter notebooks 500 internal server error, and found your question. I resolved my issue by downgrading tornado to version 5 (sudo -H pip3 install "tornado==5") and everything works again. I hope you find a solution by now or my hint helps you.

Strong