python实现控制台购物系统

#定义用户字典，用于验证登录
user = {"root": {"passwd": "123", "money": 1000},"admin": {"passwd": "admin", "money": 1000}}


#定义商品字典
product = {'f001': {"name": "apple", "price": 2.5},
                   'f002': {"name": "banana", "price": 3.5},
                   'f003': {"name": "grape", "price": 4.5},
                   'f004':{"name":"fork","price":18},
                   'f005':{"name":"sheep","price":25}}



print("-" * 50)
print('#' + "{0:^42}".format("欢迎登录三乐购物系统") + '#')
print("-" * 50)
print("温馨提示，输入quit退出系统")


#展示商品函数
def product_list():
    print("商品列表")
    for i, j in product.items():
        print(f"编号：{i}，名称：{j['name']},单价：{j['price']}")

#菜单栏
def menu():
    print("菜单栏".center(40, "-"))
    print("输入1查看商品列表".center(43))
    print("输入2查看购物车 ".center(43))
    print("输入3进行购买   ".center(43))
    print("输入4结算     ".center(43))
    print("输入5退出系统   ".center(43))
    print("-" * 43)


#购物车
def cart():
    global sum_price
    print("购物车".center(40, "*"))
    print("已购买的商品：")