Jupyter: can't create new notebook?

Question

I have some existing Python code that I want to convert to a Jupyter notebook. I have run:

jupyter notebook 

Now I can see this in my browser:

But how do I create a new notebook? The Notebook link in the menu is greyed out, and I can't see any other options to create a new notebook.

I've noticed this on the command line while Jupyter is running:

[W 22:30:08.128 NotebookApp] Native kernel (python2) is not available  

Answer 1

None of the other answers worked for me on Ubuntu 14.04. After 2 days of struggling, I finally realized that I needed to install the latest version of IPython (not the one in pip). First, I uninstalled ipython from my system with:

sudo apt-get --purge remove ipython sudo pip uninstall ipython 

I don't know if you need both, but both did something on my system.

Then, I installed ipython from source like this:

git clone https://github.com/ipython/ipython.git cd ipython sudo pip install -e .  

Note the period at the end of the last line. After this, I reran jupyter notebook and the python2 kernel was detected!

Answer 2

It looks like you don't have an IPython kernel installed (or any other kernel for that matter!).

There are various ways (old versions, new versions) to do this. One of the simplest ways is to use pip. From the command line enter:

pip install ipython 

You may also need to register the kernel with Jupyter (see the new versions page):

python -m pip install ipykernel  python -m ipykernel install [--user] [--name <machine-readable-name>] [--display-name <"User Friendly Name">] 

You should now be able to launch a Python notebook from Jupyter.

Alternatively, installing Jupyter using any of the methods on this page should ensure that the IPython kernel is already there. Personally, Anaconda has always just worked out of the box for me (when I've used it on Linux and Mac OS).