class Member:
    def __init__(self, n, d):
        self.name, self.join_date = n, d
        self.purchase_list = []
        self.purchase_amount = 0

    def information(self):
        print('회원이름 :', self.name)
        print('가입날짜 :', self.join_date)
        print('구매내역 :', self.purchase_list)
        print('누적 구매금액 :', self.purchase_amount)

    # Product 객체가 인자로 전달됨
    def buy(self, product, count):
        print(self.name, '고객님이', product.name, count, '개 구매!')
        product.stock -= count # 구매수량만큼 재고 감소
        self.purchase_list.append(product.name)         # 구매내역에 상품 추가
        self.purchase_amount += (product.price * count) # 누적 구매금액 증가