https://stackoverflow.com/questions/29765548/remove-index-name-in-pandas
    To delete index name
        Input [19] : .rename_axis(None)

https://stackoverflow.com/questions/32464280/how-to-convert-currency-column-with-and-to-numbers
    To undo currency formatting on ‘Per Student Budget’ column in order to use pd.cut 
        Input [26] : .replace('[\$,]', '', regex=True).astype(float)