"Python" simple shopping cart

#!/usr/bin/env python#-*- coding:utf-8 -*-#简单的购物车 # Knowledge Points: #1: Graceful Enumerate function, returns a Generator object: (Index, Item) tuple #2:print (' product list : ')   can center print, really fun, haha goods = [      ("IPhone", 5800),     ("Watch", "$"),     ("Mac", 12000)]goods _cart = []mybudget = raw_input ("Please enter your budget:") While not mybudget.isdigit ():     mybudget = input ("Your budget input is wrong, please re-enter.") Mybudget = int (mybudget) while true:    print  "Product List". Center (50, '-')     print  "number". Center (8, '   '), "name". Ljust (+, '   '), "Price". Ljust ('   ')     for i in enumerate (goods):    #enumerate函数会返回下标和取值          print str (I[0]). Center (6, '   '), str (i[1][0]). Ljust (28, '   '), str (i[1][1]). Ljust ('   ')     user_choose = raw_input ("Please enter your choice:")     if user_choose.isdigit ():         user_choose = int (User_choose)          if user_choose >=0 and user_choose <len (goods):   #先判断商品是否存在             if mybudget - goods[ user_choose][1] > 0:   #在判断预算是否大于0                  mybudget -= goods[user_choose][1]                 goods_cart.append (Goods[user_choose])    #商品加入购物车                  print  "Budget is%d."  % (MyBudget)             else:  & nbsp;             print  "budget is not enough."         else:             print  "The product does not exist."     elif user_choose ==  "Q":         breakprint  "Budget%d"  % (mybudget) print  "Shopping cart product Information". Center ("-") for i in  Enumerate (Goods_cart):     print str (I[0]). Center (6,  '   '),  str (I[1][0]) . Ljust (28,  '   '),  str (I[1][1]). Ljust (12,  '   ')

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This article from "Kong Love to Eat fish" blog, declined reprint!

"Python" simple shopping cart