python购物车程序代码

''''' 
Created on 2017年9月4日 
 
@author: len 
''' 
 
 
product_list = [ 
 ('Robot',200000), 
 ('MacPro',12000), 
 ('Iphone8',8888), 
 ('Hello World',1200), 
 ] 
shopping_list = [] 
user_salary=input("请输入你的工资：") 
if user_salary.isdigit(): 
 user_salary = int(user_salary) 
 while True: 
 print("商品如下：") 
 for index,item in enumerate(product_list): 
 
 print (index,item) 
 user_choice = input("请输入要购买的商品编号：") 
 if user_choice.isdigit(): 
 user_choice = int(user_choice) 
 if user_choice < len(product_list) and user_choice > -1: 
 p_item = product_list[user_choice] 
 if user_salary>=p_item[1]: 
 shopping_list.append(p_item) 
 user_salary-=p_item[1] 
 print("购买商品",p_item,"成功您的余额为",user_salary,"元！" ) 
 else: 
 print("您的余额为",user_salary,"余额不足以购买此商品，购买失败！") 
 
 else: 
 print("并无此产品！") 
 elif user_choice == "q": 
 print("--------shopping list-------") 
 for i in shopping_list: 
 print(i) 
 exit() 
 else: 
 print("invalidate！！！")