How Can I Easily Switch Between Python 2 and 3 in IPython Notebooks?

Customizing Python Version for IPython Notebooks

When using IPython notebooks, it can be convenient to switch between Python versions 2.x and 3.x. While the recommended Anaconda environment variables approach proves cumbersome, an alternative involves installing multiple IPython kernels. Below, we provide instructions for users with and without Anaconda.

For Anaconda >= 4.1.0

Starting with Anaconda 4.1.0, you can utilize the nb_conda_kernels package. By detecting and registering conda environments with notebook kernels, it simplifies the process:

• Create new conda environments with Python versions:

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

• Restart Jupyter notebook to see the new kernels in the graphical interface.

For Manual Kernel Registration

If you prefer manual kernel enrollment or have an older Anaconda version:

• Set up the Python 2.7 environment:

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

• Configure Python 3.6 environment similarly.
• When creating a new notebook, you can now select between Python 2.7 and Python 3.6 through the interface.
• To customize kernel names, use python kernel install --help for guidance.

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