根據購物車題目的需求，本次分享的程序是將商品列表分級顯示，例如：生活用品|

|牙膏

|牙刷

|毛巾

家用電器|

|電飯鍋

即將列表存儲商品信息，改成由字典來存放，程序如下：

#初始化產品菜單
product_list = {"生活用品":[[‘毛巾‘,20],
                [‘洗衣液‘,80],
                [‘衣架‘, 10],
                [‘洗衣粉‘,60],
                [‘洗發水‘, 80],
                [‘廁洗劑‘,50]],
                "家電":[[‘電視機‘,5000],
                      [‘電飯煲‘,300],
                      [‘電磁爐
 
‘,200],
                      [‘高壓鍋‘,800],
                      [‘電餅鐺‘,200]],
                }

current_layer = {}
shopping_cart = {}
shopping_cart = {}
last_layer = [ product_list ]
current_layer = product_list
salary = 0

#登錄操作
username = input("username:")
print("****************************")
password = input("password:")
print("****************************")

i = 1
while i <= 3:
    if username == "maomao" and password == "123":
        print("welecom to shopping maket")
        break

    elif i == 3:
        print("input more than three times, try again after 2 hours")
        break
    else:
        print("you put an wrong name or password,please input again")

    i += 1
    username = input("username:")
    password = input("password:")

#賬號充值操作
while True:
    temp = input("you account is zear,please rechange money to buy:")

    if temp.isdigit():
        salary = int(temp)
        break

    print("you input a unknow number,please check it and input again!")

#購物操作
while True:
    print("***************   系統操作說明   ****************")
    print("   q : 退出系統")
    print("   c : 賬號充值")
    print("   h : 購物記錄")
    print("   l : 商品列表")
    print("************************************************")

    oper = str(input(">>:")).strip()

    if oper == ‘q‘:   #判斷是否退出
        exit()

    elif oper == ‘c‘:  #判斷是否充值
        temp = input("please rechange money to buy:")
        if temp.isdigit():
            salary = int(temp)

    elif oper == ‘h‘:  # 查看購物歷史記錄
        f = open("product.txt", "r+", encoding="utf8")

        for i in f:
            print(i.strip())
        f.close()

    elif oper == ‘l‘:  #進入購物列表
        while True:
            if isinstance(current_layer, dict):   #是否為列表
                for key in current_layer:
                    print(key)
            else:
                index = 0
                for product in current_layer:
                    print(index, product)
                    index += 1

            choice = input(">>:").strip()
            if len(choice) == 0:continue

            if choice.isdigit():
                choice = int(choice)
                if choice >= 0 and choice < len(current_layer):
                    product = current_layer[choice]
                    if product[1] <= salary:
                        if product[0] in shopping_cart:
                            shopping_cart[product[0]][1] += 1
                        else:
                            shopping_cart[product[0]] = [product[1], 1]
                        salary -= product[1]
                        print("\033[42;1mAdded product: %s  into shoing cart ,you current balance %s \033[0m"
                              %(product[0],str(salary)))
                    else:
                        print("\033[42;1m [warning] you balance is no enough\033[0m, product:" + str(
                            product[1]) + " short for "+ str(product[1] - salary))
                else:
                    print("\033[41;1mYou choice product is no in product_list\033[0m")

            elif choice in current_layer:
                if isinstance(current_layer, dict):   #是否為列表
                    last_layer.append(current_layer)
                    current_layer = current_layer[choice]

            elif choice == "b": #返回上層商品目錄
                if last_layer:
                    current_layer = last_layer[-1]
                    last_layer.pop()

            elif choice == "q": #退出
                print("\033[34;1m---------------product list-----------------\033[0m")
                print("\033[42;1m")
                print("id   product       number pric Totalpric")
                index = 1
                total_mon = 0

                f = open("product.txt", "a+", encoding="utf8")
                import datetime

                for i in shopping_cart.keys():
                    total_mon += shopping_cart[i][1] * shopping_cart[i][0]

                    print("%d %10s %7d %7d %7d" % (index, i, shopping_cart[i][1], shopping_cart[i][0],
                                                   shopping_cart[i][1] * shopping_cart[i][0]))

                    if index == 1:
                        now_time = datetime.datetime.now().strftime(‘[%Y-%m-%d]‘)
                        f.write(now_time + "\n")
                        # f.write(i+ "%7d"%+shopping_cart[i][0]+"\n")
                    f.write(i + "\n")
                    index += 1
                f.close()

                print("you pay money is:", total_mon)
                print("you level money is:", salary)
                print("\033[0m")
                print("\033[34;1m-------------end-------------\033[0m")

                exit()
            elif choice == "c":  #充值
                temp = input("please rechange money to buy:")
                if temp.isdigit():
                    salary = int(temp)
            else:
                print("輸入內容不合法!")

python學習--購物車3