實現購物車：

#!/usr/bin/env python
#coding:utf-8
__author__ = "lvah"
'''
@author:wangjiazhuo
@file:購物車.py
@contact:[email protected]
@time:7/12/176:23 PM
@desc:
'''
salary = raw_input('input your salary:')
if salary.isdigit():
    salary = int(salary)
shop_car = []
mall = [
    ('Ipone',8000),
    ('Book',200),
    ('Bike',1000)
]
for item in enumerate(mall):
    num = item[0]
    name = item[1][0]
    price = item[1][1]
    print num, name, price
while True:
    choice = raw_input('choose you want to buy:      q to exit')
    if choice.isdigit():
        choice = int(choice)
        if choice <= len(mall)-1:
            p_item = mall[choice]
            if salary < p_item[1]:
                print '餘額不足，請購買其他商品或退出'
            elif salary > 0:
                shop_car.append(p_item)
                salary -= p_item[1]
                print '\n你買到的商品有:',
                for item in shop_car:
                    print item
                print '你的餘額為:%d'%salary
            else:
                pass
        else:
            print '請輸入已有的商品編號'
    elif choice == 'q':
        print '\n你買到的商品有:'
        for item in shop_car:
            print item
        print '你的餘額為:%d'%salary
        exit(0)
    else:
        print '請重新選擇'
 

執行結果：