[terry笔记]python购物程序

如下是一个购物程序：

先输入工资，显示商品列表，购买，quit退出，最后格式化输出所买的商品。

count = 0
while True:     #做一个循环判断,如果输入的不是数字，基于提示，三次后退出
    salary = input("input your salary:") #输入你的工资
    if salary.isdigit():  #输入的工资必须是数字才能往下走
        salary=int(salary)  #转换为整数型
        break
    else:
        print("Please input a number:")
        count += 1
        if count == 3:
            exit()

goods_list = [["Iphone",5800],["Macbook",12800],["iMac",15000],["ApplePen",500],["IPod",1200]]  #商品列表
shop_list = []  #购买的商品列表
msg = " Product List "
print(msg.center(30,"*"))
for i,ele in enumerate(goods_list): #遍历序列中的元素以及它们的下标
    print(i,".",ele[0],ele[1])
while True:
    choice = input("Which do you want(quit type \"quit\")>>>")
    if choice.isdigit():   #判断选择的是否是数字
        choice = int(choice)   #转换为整数型
        if choice <= len(goods_list)-1:  #选择的数字必须小于列表长度-1，因为下标从0开始
            if salary >= int(goods_list[choice][1]):  #判断工资是否够
                shop_list.append(goods_list[choice])  #够的话，把商品加入到shopList
                salary -= goods_list[choice][1]  #减去工资
                print("You just buy a %s now you have %s RMB" % (goods_list[choice][0],salary))
            else:
                print("Not enough money")
        else:
            print("There is no such things")
    elif choice == "quit":
        print("Here is what you buy:")  #这里的思路是，创建一个字典，把所买的商品格式化输出
        total = 0
        shop_dict={}
        for item in shop_list:
            things = item[0]
            money = item[1]
            total += int(money)
            if things in shop_dict:
                shop_dict[things][0] += 1
                shop_dict[things][1] += money
            else:
                shop_dict[things]=[1,money]
        for item in shop_dict.items():
            print("%s  %s个  共%s" % (item[0],item[1][0],item[1][1]))
        print("一共花了:",total)
        exit()
    else:
        print("Please input a number")
        continue