Get the Jupyter package either by downloading zip file from this git or clone this git repository.
Go into the package directory and install package by
python setup.py install
Then open a jupyter notebook jupyter notebook and find NCL in list of notebooks to use.
Start scripting like in NCL.
The NCL kernel for Jupyter will use what ever ncl version is currently sourced.
First get Miniconda, it cleanly maintains different python versions/programs within their own virtual environments, to minimize any conflicts with other packages. Moreover it is easy local installation, it sets the paths for you in the end. You can get the version for your operating system here http://conda.pydata.org/miniconda.html
Install jupyter and ncl by
conda create -n ncl_notebook -c conda-forge ncl=6.4.0 python=3.6 jupyter
if you're on mac try the below instead
conda create -n ncl_notebook -c conda-forge -c ncar ncl=6.4.0 gsl python=3.6 jupyter
Activate this environment with source activate ncl_notebook and launch the jupyter server with
jupyter notebook