Pythonic custom sort for letter grades 'D', 'C-' ,…, 'A+'?

Question

Is there a more Pythonic, compact, intuitive way to sort letter-grades than this (without using a custom dict)?

grades = [\'B-\',\'C\',\'B\',\'C+\',\'A\',\'D+\',         


        

Answer 1

No.

modmap = {
  '-': 0,
  '': 1,
  '+': 2
}

print(sorted(grades, key=lambda x: (-ord(x[0]), modmap[x[1:]])))