python学习笔记之小小购物车

#coding=utf-8
'''
Created on 2015-6-18

@author: 悦文
'''

def goods_list(): 
      
    shangpin={"coffie":"30","car":"50000","tea":"10","book":"5"}
    print "-"*12 +u"商品列表" +"-"*12
    for key in shangpin:
        print "goods: %s --> price: %s" % (key,shangpin[key])
    print "-"*12 +u"商品列表" +"-"*12
    return shangpin
     
def jiesuan(money,shangpin_list):
    sheng_money=money        
    while True:
        qt=raw_input(u"您需要购物吗？y/n 
")
        if qt=="y":
            gou_goods=raw_input(u"请输入您想购买的商品名字，购买的商品请参考商品列表：
")            
            if gou_goods in shangpin_list:               
                sheng_money=int(sheng_money)-int(shangpin_list[gou_goods])
                if sheng_money>=0:
                    print " 您购买了%s商品，共消费 %s, 您还剩 %s元钱！" % (gou_goods,shangpin_list[gou_goods],sheng_money)
                else:                   
                    print "您的金钱不足,请充值，欢迎下次光临！"
                    break
            else:
                print "没有此商品！"
        else:
            print "欢迎下次光临！"
            break
                 
    
if __name__== '__main__':

    shangpin_list=goods_list()
    try:
        money=raw_input(u"请充值后在购买商品，请输入充值金额：
")
        print "您的充值金额为 %s,充值成功！"% (money)
    except IOError,e:
        print "输入错误，请检查!"    
    jiesuan(money,shangpin_list)