I've just installed IPython
3.0 using pip
on my laptop, which is running Ubuntu
14.04:
$ pip search ipython
ipython-cluster-helper - Simplify IPython cluster start up and use for
multiple schedulers.
ipython - IPython: Productive Interactive Computing
INSTALLED: 3.0.0 (latest)
However, when I go to use IPython
, the terminal seems to think it's using version 1.2.1:
$ ipython
Python 2.7.6 (default, Mar 22 2014, 22:59:38)
Type "copyright", "credits" or "license" for more information.
IPython 1.2.1 -- An enhanced Interactive Python.
? -> Introduction and overview of IPython's features.
%quickref -> Quick reference.
help -> Python's own help system.
object? -> Details about 'object', use 'object??' for extra details.
In [1]
What's worse is, when I go to open a notebook in JSON nbformat version 4, which IPython
3.0 supports, I get the following error:
Unreadable Notebook: Unsupported JSON nbformat version 4 (supported version: 3)
I've attempted to downgrade the notebook to version 3, using the command recommended by the IPython
team, but that fails for me as well:
$ ipython nbconvert --to notebook --nbformat 3 1-intro-to-brian-neurons.ipynb
. . .
[NbConvertApp] CRITICAL | Bad config encountered during initialization:
[NbConvertApp] CRITICAL | Unrecognized flag: '--nbformat'
What's going on here?
An older version of IPython
was installed previously using apt-get
. Remove the older version using apt-get remove ipython
.