购物清单Python代码：

# 定义仓库
repository = dict()
# 定义购物清单
shop_list = []

# 初始化商品
def init_repostory():
    goods1 = ("001", "Python", 66)
    goods2 = ("002", "C++", 88)
    goods3 = ("003", "Linux", 90)
    goods4 = ("004", "MySql", 35)
    # 商品入库
    repository[goods1[0]] = goods1
    repository[goods2[0]] = goods2
    repository[goods3[0]] = goods3
    repository[goods4[0]] = goods4
# 商品清单
def show_goods():
    print("欢迎光临，欣悦超市")
    print("商品清单：")
    print('%13s%40s%10s' % ("条码", "商品名", "单价"))
    # 遍历
    for goods in repository.values():
        print('%15s%40s%12s' % goods)
# 显示购物清单
def show_list():
    print("=" * 100)
    # 输出
    if not shop_list:
        print("未购物")
    else:
        title = '%-5s|%15s|%40s|%10s|%4s|%10s' % \
                ("ID", "条码", "商品名", "单价", "数量", "小计")
        print(title)
        print("-" * 100)
        # 总计
        sum = 0
        # 遍历清单
        for i, item in enumerate(shop_list):
            id = i + 1
            code = item[0]
            name = repository[code][1]
            price = repository[code][2]
            number = item[1]
            amount = price * number
            sum = sum + amount
            line = '%-5s|%17s|%40s|%12s|%6s|%12s' % \
                   (id, code, name, price, number, amount)
            print(line)
        print("-" * 100)
        print("                     总计：", sum)
    print("=" * 100)
# 添加购买商品
def add():
    code = input("输入条码：\n")
    if code not in repository:
        print("条码错误")
        return
    # 找商品
    goods = repository[code]
    # 数量
    number = input("购买数量：\n")
    shop_list.append([code, int(number)])
# 修改数量
def edit():
    id = input("修改的ID: \n")
    index = int(id) -1
    item = shop_list[index]
    # 新的数量
    number = input("新的购买数量：\n")
    item[1] = int(number)
# 删除
def delete():
    id = input("删除的ID：")
    index = int(id) - 1
    del shop_list[index]
def payment():
    show_list()
    print('\n' * 3)
    print("下次光临")
    # 退出
    import os
    os._exit(0)
cmd_dict = {'a': add, 'e': edit, 'd': delete, 'p': payment, 's': show_goods}
#命令提示
def show_command():
    cmd = input("输入操作指令：\n" +
                "   添加（a）   修改（e）   删除（d）   结算（p）   超市商品（s）\n")
    if cmd not in cmd_dict:
        print("按指示输入")
    else:
        cmd_dict[cmd]()
init_repostory()
show_goods()
while True:
    show_list()
    show_command()