ipython server can't launch: No module named notebook.notebookapp

Question

I've been trying to setup an ipython server following several tutorials (since none was exactly my case). A couple days ago, I did manage to get it to the point where it was launching but then was not able to access it via url. Today it's not launching anymore and I can't find much about this specific error I get:

Traceback (most recent call last):   File "/usr/local/bin/ipython", line 9, in <module>     load_entry_point('ipython==4.0.0-dev', 'console_scripts', 'ipython')()   File "/usr/local/lib/python2.7/dist-packages/ipython-4.0.0_dev-py2.7.egg/IPython/__init__.py", line 118, in start_ipython     return launch_new_instance(argv=argv, **kwargs)   File "/usr/local/lib/python2.7/dist-packages/traitlets-4.0.0-py2.7.egg/traitlets/config/application.py", line 591, in launch_instance     app.initialize(argv)   File "<string>", line 2, in initialize   File "/usr/local/lib/python2.7/dist-packages/traitlets-4.0.0-py2.7.egg/traitlets/config/application.py", line 75, in catch_config_error     return method(app, *args, **kwargs)   File "/usr/local/lib/python2.7/dist-packages/ipython-4.0.0_dev-py2.7.egg/IPython/terminal/ipapp.py", line 302, in initialize     super(TerminalIPythonApp, self).initialize(argv)   File "<string>", line 2, in initialize   File "/usr/local/lib/python2.7/dist-packages/traitlets-4.0.0-py2.7.egg/traitlets/config/application.py", line 75, in catch_config_error     return method(app, *args, **kwargs)   File "/usr/local/lib/python2.7/dist-packages/ipython-4.0.0_dev-py2.7.egg/IPython/core/application.py", line 386, in initialize     self.parse_command_line(argv)   File "/usr/local/lib/python2.7/dist-packages/ipython-4.0.0_dev-py2.7.egg/IPython/terminal/ipapp.py", line 297, in parse_command_line     return super(TerminalIPythonApp, self).parse_command_line(argv)   File "<string>", line 2, in parse_command_line   File "/usr/local/lib/python2.7/dist-packages/traitlets-4.0.0-py2.7.egg/traitlets/config/application.py", line 75, in catch_config_error     return method(app, *args, **kwargs)   File "/usr/local/lib/python2.7/dist-packages/traitlets-4.0.0-py2.7.egg/traitlets/config/application.py", line 487, in parse_command_line     return self.initialize_subcommand(subc, subargv)   File "<string>", line 2, in initialize_subcommand   File "/usr/local/lib/python2.7/dist-packages/traitlets-4.0.0-py2.7.egg/traitlets/config/application.py", line 75, in catch_config_error     return method(app, *args, **kwargs)   File "/usr/local/lib/python2.7/dist-packages/traitlets-4.0.0-py2.7.egg/traitlets/config/application.py", line 418, in initialize_subcommand     subapp = import_item(subapp)   File "build/bdist.linux-x86_64/egg/ipython_genutils/importstring.py", line 31, in import_item ImportError: No module named notebook.notebookapp 

So about the setup, I have installed the anaconda distrib of ipython, pyzmq & tornado libraries. I have created a profile nbserver and the config file is as follows - ipython.config.py:

c = get_config() c.IPKernalApp.pylab = 'inline' c.NotebookApp.certfile = u'/home/ludo/.ipython/profile_nbserver/mycert.pem' c.NotebookApp.ip = '*' c.NotebookApp.open_browser = False c.NotebookApp.password = u'sha1:e6cb2aa9a[...]' c.NotebookApp.port = 9999 c.NotebookManager.notebook_dir = u'/var/www/ipynb/' c.NotebookApp.base_project_url = '/ipynb/' c.NotebookApp.base_kernel_url = '/ipynb/' c.NotebookApp.webapp_settings = {'static_url_prefix':'/ipynb/static/'} 

I really don't know where to look for clues anymore - and I'm probably lacking a greater understanding of how all this works to figure it out. My ultimate goal is to then use the answer to this question on SO to complete a setup behind apache and eventually connect it to colaboratory - but seems like it should launch first.

Many thanks for any help :)

Answer 1

This should fix the issue:

pip install jupyter 

Answer 2

I received the same problem when upgrading IPython. At the moment the answer was written, it was a bug linked to the latest 4 version. If a similar problem occurs for which you wish to switch back to the stable version 3.2.1:

pip uninstall -y IPython pip install ipython==3.2.1 

• note: the -y option indicates "yes I want to uninstall" with no interaction.
• note 2: possible duplicate in ImportError: No module named notebook.notebookapp