Cannot start ipython notebook by missing a module called zmq.eventloop

Question

I have installed ipython Notebook lately for my machine learning course following the instructions below:

Step 1: Create and activate a new virtual environment (recommended)

# Create a virtual environment named e.g. dato-env
virtualenv dato-env

# Activate the virtual environment
source dato-env/bin/activate

Step 2: Ensure pip version >= 7

# Make sure pip is up to date
pip install --upgrade pip

Step 3: Ensure installation of IPython and IPython Notebook

# Install IPython Notebook (optional)
pip install "ipython[notebook]"

Everything worked just fine till I have started ipython notebook server by typing the following command:

ipython notebook

Then the following error popped up:

Traceback (most recent call last):
File "/usr/local/bin/ipython", line 11, in <module>
sys.exit(start_ipython())
File "/usr/local/lib/python2.7/dist-packages/IPython/__init__.py", line 118, in start_ipython
return launch_new_instance(argv=argv, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/traitlets/config/application.py", line 591, in launch_instance
app.initialize(argv)
File "<decorator-gen-111>", line 2, in initialize
File "/usr/local/lib/python2.7/dist-packages/traitlets/config/application.py", line 75, in catch_config_error
return method(app, *args, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/IPython/terminal/ipapp.py", line 305, in initialize
super(TerminalIPythonApp, self).initialize(argv)
File "<decorator-gen-7>", line 2, in initialize
File "/usr/local/lib/python2.7/dist-packages/traitlets/config/application.py", line 75, in catch_config_error
return method(app, *args, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/IPython/core/application.py", line 386, in initialize
self.parse_command_line(argv)
File "/usr/local/lib/python2.7/dist-packages/IPython/terminal/ipapp.py", line 300, in parse_command_line
return super(TerminalIPythonApp, self).parse_command_line(argv)
File "<decorator-gen-4>", line 2, in parse_command_line
File "/usr/local/lib/python2.7/dist-packages/traitlets/config/application.py", line 75, in catch_config_error
return method(app, *args, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/traitlets/config/application.py", line 487, in parse_command_line
return self.initialize_subcommand(subc, subargv)
File "<decorator-gen-3>", line 2, in initialize_subcommand
File "/usr/local/lib/python2.7/dist-packages/traitlets/config/application.py", line 75, in catch_config_error
return method(app, *args, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/traitlets/config/application.py", line 418, in initialize_subcommand
subapp = import_item(subapp)
File "/usr/local/lib/python2.7/dist-packages/ipython_genutils/importstring.py", line 31, in import_item
module = __import__(package, fromlist=[obj])
File "/usr/local/lib/python2.7/dist-packages/notebook/notebookapp.py", line 32, in <module>
from zmq.eventloop import ioloop
ImportError: No module named zmq.eventloop

I have tried some of methods in the past Stackoverflow posts here and here. But seems they did not resolve my problem. I will much appreciate if anybody can help me with some workarounds and explain what're actually the issues. Thank you in advance

Best Regards,

Answer 1

I have resolved the same error on my system using this command: sudo apt-get install python-zmq