http://goo.gl/uSSmC0

for card in all_cards: if not is_condition_satisfied(card, spendings): continue saved_amount = apply_restriction(card, spendings) result += (card, saved_amount)return sorted(result, key=lambda x: x[1], reverse=True)

https://speakerdeck.com/sunghyunzz/agile-git-flow-google-play