class Warrior:
    def __init__(self):
        pass
    h = 50
    a = 5

    @property
    def health(self):
        return self.h

    @health.setter
    def health(self, value):
        self.h = value

    def attack(self):
        return self.a

    @property
    def is_alive(self):
        if self.health > 0:
            return True
        return False

class Knight(Warrior):
    a = 7

def fight(unit_1, unit_2):
    while True:
        unit_2.health = unit_2.health - unit_1.attack()
        if not unit_2.is_alive:
            return True
        unit_1.health = unit_1.health - unit_2.attack()
        if not unit_1.is_alive:
            return False

if __name__ == '__main__':
    #These "asserts" using only for self-checking and not necessary for auto-testing

    chuck = Warrior()
    bruce = Warrior()
    carl = Knight()
    dave = Warrior()
    mark = Warrior()

    assert fight(chuck, bruce) == True
    assert fight(dave, carl) == False
    assert chuck.is_alive == True
    assert bruce.is_alive == False
    assert carl.is_alive == True
    assert dave.is_alive == False
    assert fight(carl, mark) == False
    assert carl.is_alive == False

    print("Coding complete? Let's try tests!")