06->python购物车

# 购物

produce = [
    {'name': 'apple', 'price': '20'},
    {'name': 'mi', 'price': '30'},
    {'name': 'mac', 'price': '15'}
]
shopping_car = {}
exit_flag = False
print("----------商品列表----------")
money = int(input("看我看看你的钱:").strip())
# if money.isdigit():
#     money = int(money)
# else:
#     print("请重让我看看你的钱！！")
#     money = input("看我看看你的钱").strip()
while not exit_flag:
    for index, i in enumerate(produce):
        print('序号{},\t商品:{},\t价格:{}'.format(index, i['name'], i['price']))
    choice = input("请选择你要购买产品的序号：")
    if choice.isdigit():
        choice = int(choice)
        if 0 <= choice < len(produce):   # 这里不推荐这么写，为了pycharm不出警告
            num = input("你要购买商品的数量:")
            money = money - int(produce[choice]['price'])*int(num)
            if money >= 0:
                # shopping_car.append(produce[choice]['name'])
                shopping_car[produce[choice]['name']] = num
                # print("你购买的商品数量为%d" % len(shopping_car))
                for k, v in shopping_car.items():
                    print('购买商品:{},\t数量:{}'.format(k, v))
                print('余额%d' % money)

            else:
                print("穷鬼，回家拿钱去吧！！")
                break
    elif choice.upper() == 'Q':
        for k, v in shopping_car.items():
            print('购买商品:{},\t数量:{}'.format(k, v))
        print('余额%d' % money)
        exit_flag = True
    else:
        print("请选择产品的序号！！")

还可以优化通过while判断money、num

# 购物改进

produce = [
    {'name': 'apple', 'price': '20'},
    {'name': 'mi', 'price': '30'},
    {'name': 'mac', 'price': '15'}
]
shopping_car = {}
exit_flag = False
print("----------商品列表----------")
while not exit_flag:
    money = input("看我看看你的钱:").strip()
    if money.isdigit():     # 对用户输入的money进行出来
        money = int(money)
        break   # 结束当前循环
    else:
        print("请重让我看看你的钱！！")
        # money = input("看我看看你的钱").strip()
while not exit_flag:
    for index, i in enumerate(produce):
        print('序号{},\t商品:{},\t价格:{}'.format(index, i['name'], i['price']))
    choice = input("请选择你要购买产品的序号：")
    if choice.isdigit():
        choice = int(choice)
        if 0 <= choice < len(produce):   # 这里不推荐这么写，为了pycharm不出警告
            while not exit_flag:
                num = input("你要购买商品的数量:").strip()
                if num.isdigit():       # 对用户输入的num进行处理
                    break
                else:
                    print("请重新输入购买数量,靓仔！！！")
            money = money - int(produce[choice]['price'])*int(num)
            if money >= 0:
                # shopping_car.append(produce[choice]['name'])
                shopping_car[produce[choice]['name']] = num
                # print("你购买的商品数量为%d" % len(shopping_car))
                for k, v in shopping_car.items():
                    print('购买商品:{},\t数量:{}'.format(k, v))
                print('余额%d' % money)

            else:
                print("穷鬼，回家拿钱去吧！！")
                break
    elif choice.upper() == 'Q':
        for k, v in shopping_car.items():
            print('购买商品:{},\t数量:{}'.format(k, v))
        print('余额%d' % money)
        exit_flag = True
    else:
        print("请选择产品的序号！！")