Ipython Notebook - ImportError: tornado - ipython

Question

I have already updated tornado using
sudo pip install --upgrade tornado
Checking the current version show that I already have a version later than 4.0
Find the output of command:
pip show tornado | grep Version
Metadata-Version: 1.1
Version: 4.1
Any idea why Ipython notebook does not work and keeps giving me the message that i do not have tornado v4.1 and have version 3.0 instead ?. Thanks and Regards.
=========================================================================
$ipython notebook
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 120, in start_ipython
return launch_new_instance(argv=argv, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/IPython/config/application.py", line 573, in launch_instance
app.initialize(argv)
File "<string>", line 2, in initialize
File "/usr/local/lib/python2.7/dist-packages/IPython/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 321, in initialize
super(TerminalIPythonApp, self).initialize(argv)
File "<string>", line 2, in initialize
File "/usr/local/lib/python2.7/dist-packages/IPython/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 369, in initialize
self.parse_command_line(argv)
File "/usr/local/lib/python2.7/dist-packages/IPython/terminal/ipapp.py", line 316, 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/IPython/config/application.py", line 75, in catch_config_error
return method(app, *args, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/IPython/config/application.py", line 471, 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/IPython/config/application.py", line 75, in catch_config_error
return method(app, *args, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/IPython/config/application.py", line 402, in initialize_subcommand
subapp = import_item(subapp)
File "/usr/local/lib/python2.7/dist-packages/IPython/utils/importstring.py", line 42, in import_item
module = __import__(package, fromlist=[obj])
File "/usr/local/lib/python2.7/dist-packages/IPython/html/notebookapp.py", line 50, in <module>
raise ImportError(msg + ", but you have %s" % tornado.version)
ImportError: The IPython Notebook requires tornado >= 4.0, but you have 3.2

Answer 1

I had a conflicting copy of tornado (3.1.1 on ubuntu 14.04) as well. To see if this is the case for you, in a terminal use the commands:
apt-cache policy python-tornado
To print out the OS's version. If it is not the version you want, use:
sudo apt-get remove python-tornado
to remove it. If you had already installed the newer version using pip, that version will be visible to python now.

Answer 2

Maybe have many pip and many Python's. Check your pip version
pip --version
(my response) pip 1.5.4 from /usr/lib/python2.7/dist-packages (python 2.7)
and check you IPython environment:
~$ ipython3
Python 3.4.0 (default, Apr 11 2014, 13:05:11)
Type "copyright", "credits" or "license" for more information.
IPython 1.2.1 -- An enhanced Interactive Python.
If environ version are the same. Try make new environ on virtualenv

Answer 3

I have noticed that there were two Tornado packages installed on my system(Ubuntu 14.04). A Tornado 4.1 version and Tornado 3.2 version under different folders. In order to solve the problem, i renamed the folder containing the old Tornado to "Tornado-OLD".
Now Ipython Notebook is able to find the right Tornado and open on the browser.
I am not sure how it happened to have 2 versions of Torando installed, at the same time. But if you have the problem, this can probably help you.
Thanks for the contributions.
Regards
Gustavo

Answer 4

Maybe you can try:
sudo apt-get remove tornado
sudo pip uninstall tornado
sudo pip install tornado

Answer 5

The following worked for me:
Remove tornado:
sudo apt-get remove python-tornado
Reinstall tornado:
sudo pip install tornado
Upgrade tornado:
sudo pip install tornado --upgrade