python-购物车

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

str= "欢迎来到菜鸟购物系统！"
print str.center(80)
money=input("请输入您的预算：",)
def show():
    print '''本商城提供以下商品：
             kindle   $300 
             mac      $500 
             apple    $450
             mp3      $30  
             thinkpad $800 '''
show()
d={'kindle':300,'mac':500,'mp3':30,'thinkpad':800,'apple':450}

def shop(money):
    d1={}
    for i in d:
        if money>d[i]:
            d1[i]=d[i]
    print d1
    print "您可以购买的商品为："
    for i in d1:
        print " "*12,
        print "%-9s$%d"%(i,d1[i])
    k=raw_input("请输入你要购买的商品>>>",)
    l=k.split(' ')
    print l
    for i in l:
        if i not  in d:
            print "Input Error!"
            k=raw_input("请重新输入：",)
            l=[]
            l=k.split(' ')
        else:
            if money<d[i]:
                print "余额不足！"
                break
            money-=d[i]
    print "您购买的商品为:"
    for i in range(len(l)):
        print "%20s" %(l[i])

    print "您的余额还有%d,是否继续[y/n]？"%money
    k=raw_input()
    if k=="y" or k=="Y":
        shop(money)
    elif k=="n" or k=="N":
        print "感谢光临，祝您生活愉快！"
        exit
    else:print "输入错误，请输入y或n,不区分大小写！"
shop(money)