# useful constants: a dictionary to look up points
# for a given grade, and a list of grades in the
# order one would print them (since the dictionary
# will store them in a seemingly random order
points = {'A+':4.0, 'A':4.0, 'A-':3.7,
          'B+':3.3, 'B':3.0, 'B-':2.7,
          'C+':2.3, 'C':2.0, 'C-':1.7,
          'D+':1.3, 'D':1.0, 'D-':0.7,
          'F':0.0}
order = ['A+', 'A', 'A-', 'B+', 'B', 'B-',
         'C+', 'C', 'C-', 'D+', 'D', 'D-', 'F']