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

Question

I use IPython notebooks and would like to be able to select to create a 2.x or 3.x python notebook in IPython.

I initially had Anaconda. With Anaconda a global envi

Answer 1

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