Question

I tried to run IPython notebook. I entered following in the commandline:

ipython notebook

I get the following error (stack trace)

> Traceback (most recent call last):   File
> "C:\Python27\Scripts\ipython-script.py", line 9, in <module>
>     load_entry_point('ipython==0.13.1', 'console_scripts', 'ipython')()   File
> "C:\Python27\lib\site-packages\IPython\frontend\terminal\ipapp.py",
> line 388, in launch_new_instance
>     app.initialize()   File "<string>", line 2, in initialize   File "C:\Python27\lib\site-packages\IPython\config\application.py", line
> 84, i n catch_config_error
>     return method(app, *args, **kwargs)   File "C:\Python27\lib\site-packages\IPython\frontend\terminal\ipapp.py",
> line 313, in initialize
>     super(TerminalIPythonApp, self).initialize(argv)   File "<string>", line 2, in initialize   File
> "C:\Python27\lib\site-packages\IPython\config\application.py", line
> 84, i n catch_config_error
>     return method(app, *args, **kwargs)   File "C:\Python27\lib\site-packages\IPython\core\application.py", line 325,
> in  initialize
>     self.parse_command_line(argv)   File "C:\Python27\lib\site-packages\IPython\frontend\terminal\ipapp.py",
> line 308, in parse_command_line
>     return super(TerminalIPythonApp, self).parse_command_line(argv)   File "<string>", line 2, in parse_command_line   File
> "C:\Python27\lib\site-packages\IPython\config\application.py", line
> 84, i n catch_config_error
>     return method(app, *args, **kwargs)   File "C:\Python27\lib\site-packages\IPython\config\application.py", line
> 420, in parse_command_line
>     return self.initialize_subcommand(subc, subargv)   File "<string>", line 2, in initialize_subcommand   File
> "C:\Python27\lib\site-packages\IPython\config\application.py", line
> 84, i n catch_config_error
>     return method(app, *args, **kwargs)   File "C:\Python27\lib\site-packages\IPython\config\application.py", line
> 352, in initialize_subcommand
>     subapp = import_item(subapp)   File "C:\Python27\lib\site-packages\IPython\utils\importstring.py", line
> 40, i n import_item
>     module = __import__(package,fromlist=[obj])   File "C:\Python27\lib\site-packages\IPython\frontend\html\notebook\__init__.py
> ", line 8, in <module>
>     raise ImportError(msg) ImportError: The IPython Notebook requires tornado >= 2.1.0

how do I fix this?
I have Python version 2.7

Answer 1

You’ll need to install the tornado webserver. Assuming you have pip installed and on your path:

pip install tornado