針對迴圈判讀語句和列表的運用練習，對應Day2中的第一個購物車程式訓練。

能力有限，可能存在不足。

 1 # Author: JC
 2 
 3 while 1:
 4     balance = input("請輸入工資金額：")
 5     if balance.isdigit():
 6         balance = int (balance)
 7         buy_list = []
 8         goods_list = [[0,'Iphone',6000],[1,'Bike',800],[2,'Computer', 5800],[3,'Coffee
 
', 49],[4,'Winds', 200]]
 9         while True :
10             for i in goods_list :
11                 print(i)
12             goods_number = int(input("請輸入需要購買的商品編號："))
13         #print(int(goods_list [int(goods_number )][-1]))
14             if goods_number < len(goods_list) and goods_number >= 0:  #
 
 是否為列表中的數字
15                 if goods_list [goods_number ][-1] > balance :
16                     print("您的餘額只有:{balance}".format(balance = balance ))
17                     print("餘額不足夠，請選擇其他商品:")
18                     #for i in goods_list:
19                         #print(i)
20                 else
 
:
21                     balance = balance - goods_list [goods_number][-1]
22                     buy_list_provisional = goods_list[goods_number]
23                     print("購買的商品為：{list_confim}".format(list_confim=buy_list_provisional))
24                     print("所剩餘額為：%s"%balance)
25                     buy_list .append(goods_list [goods_number])
26                     buy_confim = input("是否繼續購買：y/n?")
27                     if buy_confim == 'y':continue
28                     break
29             else:print("請輸入存在的商品編號！")
30         print("已購買商品：")
31         #print(buy_list )
32         for i in  buy_list:
33             print(i)
34         print("使用者餘額為：{_balance}".format(_balance = balance ))
35         break
36     else:
37         print("請輸入金額數字！")

另附，一個比較好點的購物車程式。

 1 product_list = [
 2     ('Iphone',5800),
 3     ('Mac Pro',9800),
 4     ('Bike',800),
 5     ('Watch',10600),
 6     ('Coffee',31),
 7     ('Python',120),
 8 ]
 9 shopping_list = []
10 salary = input("Input your salary:")
11 if salary.isdigit():#判斷是否為數字
12     salary = int (salary)
13 
14     while True :
15         for index,item in enumerate (product_list) :#下標和列表內容一起列印
16             print(index,item)
17         user_choice = input("選擇購買商品：")
18         if user_choice .isdigit():#是否是數字
19             user_choice = int (user_choice)
20             if user_choice < len(product_list ) and user_choice >= 0:#是否為列表中的數字
21                 shopping_car = product_list[user_choice ]
22                 if shopping_car [1] <= salary :#買得起
23                     shopping_list.append(shopping_car)
24                     salary -= shopping_car [1] #扣費
25                     print("Add %s into shopping car,your current balance is \033[31;1m%s\033[0m."%(shopping_car ,salary))
26                     #凸顯色彩輸出格式
27                 else:
28                     print("\033[23;1m你的餘額只剩[%s]啦，還買個毛線啊！\033[0m"%salary )
29             else:
30                 print("Product code [%s] is not exist!"%user_choice)
31                 print("Please choice production again:")
32         elif user_choice == 'q':
33             print("--------shopping list--------")
34             for p in shopping_list :
35                 print(p)
36                 print("Your current balance:",salary )
37                 exit()
38         else:
39             print("invalid option")
40 else:
41     print("Please enter number...")