python folium: how to display map change over time - folium

I am trying to follow the example given in the github of folium (here). Suppose I have another csv file called 'US_Unemployment_Nov2012.csv'. I could generate another map with color following the example's procedure. If I want to display one map, on which the color change over the time. I found some heat map with time series, but I don't know how to fit in my situation. How to implement it? Thanks!

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