购物

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#!/usr/bin/env python
import sys
'''简单的购物菜单，根据输入的金额，减去选择的商品得到剩下的金额，
一旦省下的金额小于所有的商品价格，提示余额不足'''
product = []
price = []
f = open('act.txt')
for line in f.readlines():
    p = line.split()[0]
    pp = line.split()[1]
    product.append(p)
    price.append(int(pp))
f.close()
shop_list =[]
while True:
    try:
        money = int(raw_input("How money you have:"))
        break
    except ValueError:
        print "wrong enter"
while True:
    for p in product:
        print p,price[product.index(p)]
    print "buy sth~"
    choose = raw_input("please enter which one you buy:").strip()
    if choose == "quit":
            sys.exit()
    if choose in product:
            product_price = price[product.index(choose)]
            if money > product_price:
                shop_list.append(choose)
                print "Add %s into your basket" % choose
                money = money - product_price
                print "you have %s money to buy sth" % money
            else:
                if money < min(price):
                    print "go home baby,there is no money to afford sth"
                    print "%s to buy successful" % shop_list
                    sys.exit()
                else:
                    print "you can't afford this product"

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