#!/usr/bin/env python
#-*- coding:utf-8 -*-

#簡單的購物車
#知識點:
#1：優雅的enumerate函數，返回一個生成器對象：（index,item）的元組
#2：print(‘product list :’.center(50,’-‘)) 可以居中打印，真好玩，哈哈

goods = [
    ("IPhone",5800),
    ("watch",2000),
    ("mac",12000)]

goods_cart = []

mybudget = raw_input("請輸入您的預算:")

while not mybudget.isdigit():
    mybudget = input("您的預算輸入有誤,請重新輸入.")

mybudget = int(mybudget)

while True:
    print "商品列表".center(50,‘-‘)
    print "編號".center(8,‘ ‘),"名稱".ljust(30,‘ ‘),"價格".ljust(12,‘ ‘)

    for i in enumerate(goods):   #enumerate函數會返回下標和取值
        print str(i[0]).center(6,‘ ‘),str(i[1][0]).ljust(28,‘ ‘),str(i[1][1]).ljust(12,‘ ‘)

    user_choose = raw_input("請輸入你的選擇:")

    if user_choose.isdigit():
        user_choose = int(user_choose)
        if user_choose >=0 and user_choose <len(goods):  #先判斷商品是否存在
            if mybudget - goods[user_choose][1] > 0:  #在判斷預算是否大於0
                mybudget -= goods[user_choose][1]
                goods_cart.append(goods[user_choose])  #商品加入購物車
                print "預算還有%d." %(mybudget)
            else:
                print "預算不夠了."
        else:
            print "商品不存在."

    elif user_choose == "q":
        break

print "還剩預算%d" %(mybudget)
print "購物車商品信息".center(50,"-")

for i in enumerate(goods_cart):
    print str(i[0]).center(6, ‘ ‘), str(i[1][0]).ljust(28, ‘ ‘), str(i[1][1]).ljust(12, ‘ ‘)

效果圖

本文出自 “孔小發愛吃魚” 博客，謝絕轉載！

【python】簡單的購物車