Key Ideas

• The information to be visualized can come from an input file.

Lecture Activity

• The file montana.txt contains census data from this source.
• The program montana.py displays this data. Make sure you fully understand how this program works.

Active Learning

• Modify the program above so that it shows the net population increase (or decrease) from one census date to the next in a second figure. (The first figure should continue to show the original graph.)
• Time permitting, add a third figure that displays the data in some other interesting manner.