Custom Sort Function in Python

custom_sort.py

# sort things by highest priority & lowest time

thing1 = {'id': 1, 'priority': 1, 'time': 500}
thing2 = {'id': 2, 'priority': 5, 'time': 400}
thing3 = {'id': 3, 'priority': 5, 'time': 600}
thing4 = {'id': 4, 'priority': 10, 'time': 100}
things = [thing1, thing2, thing3, thing4]

def sort_things(thing1, thing2):
  if thing1['priority'] > thing2['priority']:
      return -1
  elif thing1['priority'] < thing2['priority']:
      return 1
  elif thing1['time'] < thing2['time']:
      return -1
  elif thing1['time'] > thing2['time']:
      return 1
  else:
      return 0

things_sorted = sorted(things, cmp=sort_things)
things_sorted_ids = map(lambda x: x['id'], things_sorted)
expected_sorted_ids = [4, 2, 3, 1]

print('sorted_ids={}'.format(things_sorted_ids))
print('expected_ids={}'.format(expected_sorted_ids))
assert(things_sorted_ids == expected_sorted_ids)