Jupyter notebook with Python 2 and Python3 Kernel

Question

I want to run Python2 as well as Python3 kernel from Jupiter notebook. I am using Anaconda for Python and Jupyter distribution.

Lokeshs-MacBook-Air-2:~ lokeshagrawal$ conda --version
conda 4.5.12

Lokeshs-MacBook-Air-2:~ lokeshagrawal$ which python
/anaconda3/bin/python

Lokeshs-MacBook-Air-2:~ lokeshagrawal$ which jupyter notebook
/anaconda3/bin/jupyter

[![Lokeshs-MacBook-Air-2:~ lokeshagrawal$ python --version
Python 3.7.2

As you can see in the image below, I only have an option to start Python3 kernel from Jupyter. How can I have Python2 and Python3 both?

Dylan · Accepted Answer · 2019-03-17 07:05:27Z

5

Make sure you have pip version greater than 9.0

$ python2 -m pip --version

Then do this

$ python2 -m pip install ipykernel OR python2 -m pip install ipykernel --user
$ python2 -m ipykernel install --user

Start or restart Jupyter and you should be done.

This solution is from the ipython docs by the way.

answered Mar 17, 2019 at 7:05

Dylan

6551 gold badge9 silver badges21 bronze badges

Sign up to request clarification or add additional context in comments.

7 Comments

ThinkGeek Over a year ago

No it didnt give any error, but when I restarted notebook after performing steps above list still shows just a Python3

ThinkGeek Over a year ago

I am not sure if this has anything to do with Conda.

Dylan Over a year ago

try shutting jupyter down completely from the cli and then try?

Dylan Over a year ago

I doubt it has anything to do with conda, because i'm using it too

ThinkGeek Over a year ago

Thanks Dylan for helping out.

|

Prayson W. Daniel · Accepted Answer · 2019-04-04 07:22:43Z

2

You can do:

conda create —name py2 python=2.7 anaconda 
conda activate py2
(py2) conda install ipykernel -y
(py2) python -m ipykernel install --user --name py2 --display-name "Python 2.7"

This creates an environment called py2 with Python 2.7 and adds it to your kernel with name Python 2.7

If we want to have other versions e.g. Python 3.7 also, we can do the same steps:

conda update conda
conda create —name py3 python=3.7 anaconda 
conda activate py3
(py3) conda install ipykernel -y
(py3) python -m ipykernel install --user --name py3 --display-name "Python 3.7"

Note: you do not have to add 'anaconda' packages. Hope this helps you understand how to add environments to your jupyter kernel.

See: Anaconda Documentation

edited Apr 4, 2019 at 7:22

answered Mar 17, 2019 at 15:07

Prayson W. Daniel

15.8k6 gold badges57 silver badges62 bronze badges

1 Comment

Prayson W. Daniel Over a year ago

Always a pleasure

Collectives™ on Stack Overflow

Jupyter notebook with Python 2 and Python3 Kernel

2 Answers 2

7 Comments

1 Comment

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

7 Comments

1 Comment

Your Answer

Sign up or log in

Post as a guest

Linked

Related