黄焖鸡

代码

# 商品属性
ITEM = {'ITEM0001': {'name': '黄焖鸡', 'price': 18},
        'ITEM0013': {'name': '肉夹馍', 'price': 6},
        'ITEM0022': {'name': '凉皮', 'price': 8}
        }

# 打折商品列表
DISCOUNT_ITEM = ('ITEM0001', 'ITEM0022')

# 满减优惠列表
BREAK_DISCOUNT = {30: 6}
BREAK_PRICE_LIST = [30]

# 打折优惠力度
CHARGE_PERCENT = 0.5


def bestCharge(order=None):
    """
    接收用户选择的菜品和数量， 计算汇总信息
    :param order:       list        用户订单数据
    """
    # 指定菜品半价(黄焖鸡，凉皮)，省13元
    totle_price = 0  # 商品总价
    sale_price = 0  # 特定商品打折金额
    order_menu = []
    discount_names = []

    for line in order:
        item, num = line.split(' x ')
        price = ITEM[item]['price']
        name = ITEM[item]['name']
        item_pay = int(num) * price
        totle_price += item_pay
        out_str = '{} x {} = {}元'.format(name, num, item_pay)
        order_menu.append(out_str)

        if item in DISCOUNT_ITEM:
            sale_price += price * CHARGE_PERCENT
            discount_names.append(name)

    break_discount_price = 0
    break_menu_str = ''

    # 判断最优的满减额度
    for break_price in BREAK_PRICE_LIST:
        if break_price <= totle_price:
            break_discount_price = BREAK_DISCOUNT.get(break_price)
            break_menu_str = '满{}减{}元，省{}元'.format(break_price, break_discount_price, break_discount_price)
            break
    # 输出结果
    chargeOut(break_discount_price, sale_price, order_menu, discount_names, break_menu_str, totle_price)


def chargeOut(break_discount_price, sale_price, order_menu, discount_names, break_menu_str, totle_price):
    """
    结果输出函数， 选取最优的优惠方式，两种优惠方式省钱一样多，使用满减优惠方式
    :param break_discount_price:    int         满减优惠总价
    :param sale_price:              int         打折商品优惠总价
    :param order_menu:              list        用户订单明细列表
    :param discount_names:          list        打折商品名称列表
    :param break_menu_str:          str         满减商品明细
    :param totle_price:             int         商品原价
    :return:
    """
    print('============= 订餐明细 =============')
    # 输出明细
    for line in order_menu:
        print(line)
    print('-----------------------------------')
    if break_discount_price == sale_price == 0:
        discount = 0
    elif break_discount_price >= sale_price:
        print(break_menu_str)
        discount = break_discount_price
        print('-----------------------------------')
    else:
        names = ','.join(discount_names)
        discount = sale_price
        print("""使用优惠:
指定菜品半价({})，省{}元""".format(names, int(sale_price)))
        print('-----------------------------------')
    real_pay = totle_price - discount
    print('总计：{}元'.format(int(real_pay)))
    print('===================================')


if __name__ == '__main__':
    order = ["ITEM0013 x 5", "ITEM0022 x 1"]
    # order = ["ITEM0013 x 4", "ITEM0022 x 1"]
    # order = ["ITEM0013 x 4"]
    # order = ["ITEM0001 x 1", "ITEM0013 x 2", "ITEM0022 x 1"]
    bestCharge(order)