Python如何实现的简单购物车程序

# 正整数校验函数
def is_positive_int(input_num):
    # noinspection PyBroadException
    # 上一条注释消除Pycharm 'Too broad exception clause' 警告
    try:
        positive_int = int(input_num)
        if positive_int > 0:
            return True
        else:
            return False
    except Exception:
        return False


# 打印商品列表函数
def print_list(__object):
    # noinspection PyBroadException
    # 上一条注释消除Pycharm 'Too broad exception clause' 警告
    try:
        for index in range(0, len(__object)):
            print('%d\t%-10s\t%s' % (index + 1, __object[index][0], __object[index][1]))
    except Exception:
        return None


# 定义初始商品列表和购物车列表
product_list = [
    ['iPhone 12', 10000],
    ['iPhone 11', 6000],
    ['HUAWEI P30', 5000],
    ['荣耀 30', 4000],
    ['小米 10', 3000],
    ['红米 K40', 2000]
]
product_list_shopped = []

print('Welcome to shopping mall!')

# 输入购物预算,并校核预算是否合法
while True:
    budget_input = input('您的购物预算是多少：')
    if is_positive_int(budget_input):
        budget = int(budget_input)
        break
    else:
        print('输入有误,请重新输入.', end='')

# 首次打印商品列表
print('Product list：')
print_list(product_list)

# 进入购物程序
while len(product_list) > 0:
    choice = input('选择购买商品编号[退出：quit]：')
    if choice == 'quit':
        break
    # 校验输入的商品编号是否存在
    elif is_positive_int(choice) and 0 < int(choice) < len(product_list) + 1:
        product_index = int(choice) - 1
        product_price = product_list[product_index][1]
        # 余额判断购物是否成功
        if budget > product_price:
            budget = budget - product_price
            product = product_list.pop(product_index)
            product_list_shopped.append(product)
            print('购买成功,购买了%s,花费%d,您的剩余预算为：%d' % (product[0], product_price, budget))
            print_list(product_list)
        elif budget == product_price:
            budget = budget - product_price
            product = product_list.pop(product_index)
            product_list_shopped.append(product)
            print('购买成功,您的预算已花完.')
            break
        else:
            print('余额不足,请重新', end='')
    else:
        print('输入有误,请重新', end='')

# 购物车不为空时,打印购物列表和花费
if product_list_shopped:
    sum_price = sum(x[1] for x in product_list_shopped)
    print('您一共花费%d,购物清单如下：' % sum_price)
    print_list(product_list_shopped)
print('欢迎下次光临！')