购物车程序

#!/usr/bin/env python
#_*_ coding:utf-8 _*_
product_list = [
    ('Iphone',5800),
    ('Mac Pro',9800),
    ('Bike',800),
    ('Watch',10600),
    ('Coffe',31),
    ('Jack Python',120)
]
shopping_list = []
salary = input("input your salary:")
if salary.isdigit():
    salary = int(salary)
    while True:
        #for item in product_list:
        #print(product_list.index(item),item)
        for index,item in enumerate(product_list):
            print(index,item)
        user_choice = input("选择要买什么？>>>:")
        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: #买的起
                    shopping_list.append(p_item)
                    salary -= p_item[1]
                    print("added %s into shopping cart,your current balance is 33[31;1m%s33[m" %(p_item,salary))
                else:
                    print("33[41;1m你的余额只剩[%s]啦，不能购买此款产品33[0m" % salary)
            else:
                print("product code [%s] is not exist!"% user_choice)
        elif user_choice =='q':
            print("----shopping list----")
            for p in shopping_list:
                print(p)
            print("your current balance:",salary)
            exit()
        else:
            print("invalid option")

############################################

enumerate用法：

取列表下标和对应的值

#!/usr/bin/env python
#_*_ coding:utf-8 _*_

a = [1,2,3]
for i in enumerate(a):
    print(i)