Python练习程序(二)文件处理和列表元组

程序:
- 让用户输入薪资
- 输出商品及商品价格
- 计算用户能否支付
- 输出剩余的钱,问用户是否继续购物,直到钱不够为止

程序使用的shop.txt文件内容:

[root@localhost py]# cat shop.txt 
mac     10000
iphone  5000
tea     400
coffee  35
boots   999

===================================

#!/usr/bin/env python
#coding=utf-8
import sys

f=file('shop.txt')
products = []
prices = []
shop_list = []
shop_count = []    #存储购买物品,计算同一物品购买数量
for line in f.readlines():
        new_line = line.split()    #通过指定分隔符对字符串进行切片
        products.append(new_line[0])
        prices.append(int(new_line[1]))  #默认str类型

salary = int(raw_input('请输入你的工资:'))
while True:
        print "~~~~~~~~~~~~~~~~~商品列表:~~~~~~~~~~~~~~~~~"
        for p in products:
                print p,'\t',prices[products.index(p)]
        choice = raw_input('请选择你购买的商品:')
        f_choice = choice.strip()  #移除字符串头尾指定的字符(默认为空格)
        if f_choice in products:
                price = prices[products.index(f_choice)]
                if salary >= price:
                        shop_list.append(f_choice)
                        print f_choice,price,"已经添加到购物车中。"
                        salary = salary - price
                        print "您的余额:" ,salary
                        if f_choice not in shop_count:
                                shop_count.append(f_choice)
                else:
                        if salary < min(prices):
                                print"余额不足。一共买了这些商品:"
                                for p in shop_count:
                                        print "%s\t*%d"%(p,shop_list.count(p))
                                sys.exit()      #程序退出
                        else:print "对不起,您的余额:%d。请购买其他商品" %salary
        else:print"选择不在商品列表中。"

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