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

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生来不讨喜
生来不讨喜 2020-11-22 02:27

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

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  •  悲&欢浪女
    2020-11-22 03:06

    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.

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