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Data Visualization With Altair

Code and resources originally from a NICAR 2019 session; last updated March 2020.

How to install

Fork or clone this repo to your computer. Make sure you have Python 3 and Pipenv installed on your computer.

Open this folder in your terminal and run pipenv install. This may take a few minutes — among other things, it will install Pandas, Numpy, Jupyter, Jupyter Lab and, of course, Altair.

Once that's done, run pipenv shell and then jupyter lab. This should open up in your browser.

(Note: You should also be able to run this with the jupyter notebook command; jupyter lab is the next generation of Jupyter, though, and gives you some additional options, like a file-management interface and the ability to have multiple files open in different panes at the same time.)

Exploring the data

The project data is in the data directory. You can open the files right inside Jupyter Lab and check out how they're structured, or load them into your notebook with Pandas; the data definitions and sources are listed in that directory's readme.

Running the code

Open up the fun-with-altair.ipynb file. That's your working file; it's got all the libraries you'll need, the dataset imports and the prompts for what you'll do each step of the way. Run cells by hitting shift-enter. Try to follow the prompts by looking at the Altair documentation and Googling. If you get stuck, I give you permission to open the fun-with-altair-SOLUTIONS.ipynb notebook and peek, but try to make the charts before you do that!

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Walk through making basic charts — and a choropleth map — with this Altair tutorial.

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