Using both Python 2.x and Python 3.x in IPython Notebook

The idea here is to install multiple ipython kernels. Here are instructions for anaconda. If you are not using anaconda, I recently added instructions using pure virtualenvs.

Anaconda >= 4.1.0

Since version 4.1.0, anaconda includes a special package nb_conda_kernels that detects conda environments with notebook kernels and automatically registers them. This makes using a new python version as easy as creating new conda environments:

conda create -n py27 python=2.7 ipykernel conda create -n py36 python=3.6 ipykernel 

After a restart of jupyter notebook, the new kernels are available over the graphical interface. Please note that new packages have to be explicitly installed into the new environments. The Managing environments section in conda's docs provides further information.

Manually registering kernels

Users who do not want to use nb_conda_kernels or still use older versions of anaconda can use the following steps to manually register ipython kernels.

configure the python2.7 environment:

conda create -n py27 python=2.7 conda activate py27 conda install notebook ipykernel ipython kernel install --user 

configure the python3.6 environment:

conda create -n py36 python=3.6 conda activate py36 conda install notebook ipykernel ipython kernel install --user 

After that you should be able to choose between python2
and python3 when creating a new notebook in the interface.

Additionally you can pass the --name and --display-name options to ipython kernel install if you want to change the names of your kernels. See ipython kernel install --help for more informations.

If you’re running Jupyter on Python 3, you can set up a Python 2 kernel like this:

python2 -m pip install ipykernel python2 -m ipykernel install --user 

http://ipython.readthedocs.io/en/stable/install/kernel_install.html

These instructions explain how to install a python2 and python3 kernel in separate virtual environments for non-anaconda users. If you are using anaconda, please find my other answer for a solution directly tailored to anaconda.

I assume that you already have jupyter notebook installed.

First make sure that you have a python2 and a python3 interpreter with pip available.

On ubuntu you would install these by:

sudo apt-get install python-dev python3-dev python-pip python3-pip 

Next prepare and register the kernel environments

python -m pip install virtualenv --user # configure python2 kernel python -m virtualenv -p python2 ~/py2_kernel source ~/py2_kernel/bin/activate python -m pip install ipykernel ipython kernel install --name py2 --user deactivate # configure python3 kernel python -m virtualenv -p python3 ~/py3_kernel source ~/py3_kernel/bin/activate python -m pip install ipykernel ipython kernel install --name py3 --user deactivate 

To make things easier, you may want to add shell aliases for the activation command to your shell config file. Depending on the system and shell you use, this can be e.g. ~/.bashrc, ~/.bash_profile or ~/.zshrc

alias kernel2='source ~/py2_kernel/bin/activate' alias kernel3='source ~/py3_kernel/bin/activate' 

After restarting your shell, you can now install new packages after activating the environment you want to use.

kernel2 python -m pip install <pkg-name> deactivate 

or

kernel3 python -m pip install <pkg-name> deactivate 

With a current version of the Notebook/Jupyter, you can create a Python3 kernel. After starting a new notebook application from the command line with Python 2 you should see an entry „Python 3“ in the dropdown menu „New“. This gives you a notebook that uses Python 3. So you can have two notebooks side-by-side with different Python versions.

The Details

1. Create this directory: mkdir -p ~/.ipython/kernels/python3

2. Create this file ~/.ipython/kernels/python3/kernel.json with this content:

   { "display_name": "IPython (Python 3)", "language": "python", "argv": [ "python3", "-c", "from IPython.kernel.zmq.kernelapp import main; main()", "-f", "{connection_file}" ], "codemirror_mode": { "version": 2, "name": "ipython" } } 

3. Restart the notebook server.

4. Select „Python 3“ from the dropdown menu „New“
5. Work with a Python 3 Notebook
6. Select „Python 2“ from the dropdown menu „New“
7. Work with a Python 2 Notebook

From my Linux installation I did:

sudo ipython2 kernelspec install-self

And now my python 2 is back on the list.

Reference:

http://ipython.readthedocs.org/en/latest/install/kernel_install.html

UPDATE:

The method above is now deprecated and will be dropped in the future. The new method should be:

sudo ipython2 kernel install

Following are the steps to add the python2 kernel to jupyter notebook::

open a terminal and create a new python 2 environment: conda create -n py27 python=2.7

activate the environment: Linux source activate py27 or windows activate py27

install the kernel in the env: conda install notebook ipykernel

install the kernel for outside the env: ipython kernel install --user

close the env: source deactivate

Although a late answer hope someone finds it useful :p

Use sudo pip3 install jupyter for installing jupyter for python3 and sudo pip install jupyter for installing jupyter notebook for python2. Then, you can call ipython kernel install command to enable both types of notebook to choose from in jupyter notebook.

I looked at this excellent info and then wondered, since

1. i have python2, python3 and IPython all installed,
2. i have PyCharm installed,
3. PyCharm uses IPython for its Python Console,

if PyCharm would use

1. IPython-py2 when Menu>File>Settings>Project>Project Interpreter == py2 AND
2. IPython-py3 when Menu>File>Settings>Project>Project Interpreter == py3

ANSWER: Yes!

P.S. i have Python Launcher for Windows installed as well.

Under Windows 7 I had anaconda and anaconda3 installed. I went into \Users\me\anaconda\Scripts and executed

sudo .\ipython kernelspec install-self 

then I went into \Users\me\anaconda3\Scripts and executed

sudo .\ipython kernel install 

(I got jupyter kernelspec install-self is DEPRECATED as of 4.0. You probably want 'ipython kernel install' to install the IPython kernelspec.)

After starting jupyter notebook (in anaconda3) I got a neat dropdown menu in the upper right corner under "New" letting me choose between Python 2 odr Python 3 kernels.

• If you are running anaconda in virtual environment.
• And when you create a new notebook but i's not showing to select the virtual environment kernel.
• Then you have to set it into the ipykernel using the following command

$ pip install --user ipykernel $ python -m ipykernel install --user --name=test2