Código base de ejemplo para mi artículo sobre anotaciones de tipos en Python 3

score.py

from collections import defaultdict

class KillEvent:
    def __init__(self, killer, victim):
        self.killer = killer
        self.victim = victim

class Match:
    def __init__(self, players):
        self.players = players
        self.events = []

    def new_kill(self, killer, victim):
        kill = KillEvent(killer, victim)
        self.events.append(kill)

    def score_table(self):
        score = defaultdict(int)    # esto inicializa todos los values en 0
        for kill in self.events:
            score[kill.killer] += 1
            score[kill.victim] -= 1
        return score

    def score_for(self, player):
        score_table = self.score_table()
        return score_table[player]