Let's make an Asthma Choropleth using open data, ogr2ogr, folium and pandas (and indirectly leaflet.js, d3.js, GeoJSON, open street maps and moar) and talk about using gist and blocks..
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get UK Asthma data http://customer.instantatlas.com/INHALE/dataviews/ for this example I use dataView12_17.csv
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get some CCG map boundaries
wget 'https://geoportal.statistics.gov.uk/Docs/Boundaries/Clinical_commissioning_groups_(Eng)_Apr_2013_Boundaries_(Generalised_Clipped).zip'
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make CCG map boundaries into GeoJSON format