03-python3.5-模拟购物车流程--更新追加细节注释功能

03-python3.5-模拟购物车流程--更新追加细节注释功能：

模拟购物车更新脚本：

 #!/usr/bin/env python
 #-*- coding: utf-8 -*-
 #__author__ = "XZ"

 product_list = [
     ('Iphone',5800),
     ('Mac Pro',8900),
     ('Watch',12000),
     ('Book',120),
     ('Bike',800),
     ('Coffee',31),
 ]

 shopping_list = []
 salary = input("Input your salary: >>>")
 print(product_list[0][0],type(product_list[0][0]))
 print(product_list[0][1],type(product_list[0][1]))
 if salary.isdigit():
     salary = int(salary)
     while True:
         for index,item in enumerate(product_list):
             print(index,item)
         user_choice = input("请输入您需要购买商品的商品编号: >>>")
         if user_choice.isdigit():
             user_choice = int(user_choice)
             if user_choice < len(product_list) and user_choice >= 0:
                 p_item = product_list[user_choice]
                 if p_item[1] <= salary:
                     salary -= p_item[1]
                     shopping_list.append(p_item)
                     print("Add %s into your shopping cart , your current balance is \033[31;1m%s\033[0m" %(p_item,salary))
                 else:
                     print("\033[41;1m您的余额还剩%s啦，还买个毛线呢！\033[0m")
             else:
                 print("\033[41;1m您输入的商品编号不存在请输入正确的商品编号！\033[0m")
         elif user_choice == 'q':
             print("---------Shopping Cart List--------")
             for p in shopping_list:
                 print(p)
             print("your currrent balance is %s" %(salary))
             exit()
         else:
             print("\033[41;1mInvalid Optiong,请输入十进制格式的商品编号！\033[0m")