multicolumn_sort.py

from operator import itemgetter
from pprint import pprint

data = [
    {'a': a, 'b': b}
    for a in reversed(range(4))
    for b in reversed(range(10, 18, 2))
]
pprint(data)

sorted_data = sorted(data, key=itemgetter('a', 'b'))
pprint(sorted_data)