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 33[31;1m%s33[0m" %(p_item,salary))
                else:
                    print("33[41;1m您的余额还剩%s啦，还买个毛线呢！33[0m")
            else:
                print("33[41;1m您输入的商品编号不存在请输入正确的商品编号！33[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("33[41;1mInvalid Optiong,请输入十进制格式的商品编号！33[0m")