学习笔记，类，士兵突击

class Gun():
    def __init__(self, gun_name, bullet=0):
        self.gun_name = gun_name
        self.bullet = bullet

    def __str__(self):
        return "[%s]子弹数[%d]" % (self.gun_name, self.bullet)

    def add_bullet(self, bullet):
        self.bullet += bullet

    def shoot(self):
        if self.bullet <= 0:
            print("没有子弹了")
            return
        self.bullet -= 1
        print("piu，让子弹飞一会")
        print("剩余子弹%d发" % self.bullet)


class Person():
    def __init__(self, name):
        self.name = name
        self.gun = "赤手空拳"

    def __str__(self):
        return "%s现在的武器是[%s]" % (self.name, self.gun)

    def fire(self):
        if self.gun == "赤手空拳":
            print("没枪呀，打不过")
            return
        self.gun.add_bullet(20)
        print("装填子弹，干他")
        self.gun.shoot()


ak = Gun("AK47")
xsd = Person("许三多")
print(xsd)
xsd.fire()
xsd.gun = ak
print(xsd)
xsd.fire()