File size: 481 Bytes
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class Starship:
    captain: str = 'Picard'
    damage: int
    stats: ClassVar[Dict[str, int]] = {}

    def __init__(self, damage: int, captain: str = None):
        self.damage = damage
        if captain:
            self.captain = captain  # Else keep the default

    def hit(self):
        Starship.stats['hits'] = Starship.stats.get('hits', 0) + 1

enterprise_d = Starship(3000)
enterprise_d.stats = {} # Flagged as error by a type checker
Starship.stats = {} # This is OK