Bioinformatics python capstone lesson

This lesson is intended to be a 1.5 hour demo that will sit at the end of a novice python bootcamp and show learners how to apply some of their new skills to bioinformatics. Currently work in progress, contributions/suggestions very welcome!
Add in "CpG islands are regions of the genome with high numbers of cytosines and guanines in a linear arrangement. These cytosines in these combinations can be methylated, which can be an important epigenetic markers for gene regulation." or something... I don't really know a ton about CpG sites.