一个很low的购物车系统还花了我一下午时间

 1 # Author:Zhiyu Su
 2 
 3 shopping_list=[]
 4 f=open(‘product.txt‘,‘r‘,encoding=‘utf-8‘)
 5 product_list=eval(f.read())
 6 
 7 l = open(‘历史购买数据.txt‘, ‘r‘, encoding=‘utf-8‘).read()
 8 
 9 
10 
11 salary = l
12 print(‘以前购物余额‘,salary)
13 
14 salary = input("input your salay")
15 if salary.isdigit():#字符串形式的数字返回为真
16     salary = int(salary)
17     while True:
18         for index,item in enumerate(product_list):#enumerate 取元素的下标
19 
20             #print(product_list.index(item),item)
21             print(index,item)
22         user_choice = input("选择》》》》》》》》")
23         if user_choice.isdigit():
24             user_choice=int(user_choice)
25             if user_choice < len(product_list) and user_choice >=0:
26                 p_item = product_list[user_choice]
27                 if p_item[1] <= salary:#买的起
28                     shopping_list.append(p_item)
29                     print(shopping_list)
30                     salary-= p_item[1]
31                     print("added%s into shopping cart your crent balance is \033[31;1m%s\033[0m" %(p_item,salary))  #字体红色 \033[31;1m**\033[0m
32                 else:
33                     print("\033[41;1m你的余额只剩[%s]啦，还买个毛线\033[0m"%salary)
34             else:
35                 print("不存在[%s]"% user_choice)
36         elif user_choice == ‘q‘:
37             print("-----------shopping list--------------")
38             for p in shopping_list:
39                 print(p)
40             print("your current balance:",salary)
41             k = open(‘历史购买数据.txt‘, ‘w‘, encoding=‘utf-8‘)
42             k.write(str(salary))
43             k.write(str(p))
44             k.close()
45             exit()
46         else:
47             print("sojdioj")
48 f.close()

 1 # Author:Zhiyu Su
 2 
 3 
 4 
 5 
 6 f =  open(‘product.txt‘,‘r‘,encoding=‘utf-8‘)
 7 
 8 
 9 data = eval(f.read())
10 f_new =  open(‘product.txt‘,‘w‘,encoding=‘utf-8‘)
11 # for i in data:
12 #     print(i)
13 
14 for index,item in enumerate(data):#enumerate 取元素的下标
15        print(index,item)
16 Choice = input(‘你要修改商品按x你要添加商品按t>>>>‘)
17 if Choice ==‘x‘:
18     choice = int(input("选择要修改的商品号》》》"))
19     if choice <len(data):
20         print(data[choice])
21         choice2 = input(‘修改名称按--m--还是修价格按--q-->>>‘)
22         if choice2 ==‘m‘:
23             choice3 = input("你要修改的商品名称>>>>>")
24             data[choice][0]=choice3
25             print(data)
26             f_new.write(str(data))
27         elif choice2 == ‘q‘:
28             choice4 = input("你要修改的商品名称>>>>>")
29             data[choice][1] = choice4
30             print(data)
31             f_new.write(str(data))
32 elif Choice == ‘t‘:       #添加功能
33     App = input(‘商品名称>>>>>>‘)
34     end = input(‘商品价格>>>>>>‘)
35     data.append([App,end])
36     f_new.write(str(data))
37 else:
38     print(‘兄弟只有t和x‘)
39 f.close()
40 f_new.close()