'''简单购物商城（要求）：
1，商品展示，价格
2，买，加入购物车
3，付款，钱不够
'''
 1 #_*_ coding: utf-8 _*_

 __author__ = 'A-rno'

 meu_list_1 = {

     'phone' : 100,

     'bike' : 50,

     'bnana' : 200,

     'ball' : 1000,

 }#商品列表

 meu_list_2 = [

     ['a','pay for it'],

     ['b','out'],

 ]#付款与退出列表

 def show_meu(meu_list):#主菜单显示

     if type(meu_list) == dict:

         for num,key in enumerate(meu_list.keys()):

             print num,',',key,',',meu_list[key]

     if type(meu_list) == list:

         for num,vel in meu_list:

             print num,',',vel

     pass

 def input_judge():#输入判断

     user_input = raw_input("input you choice:").strip()

     if user_input.isdigit():

         user_input = int(user_input)

         return user_input

     elif user_input == 'b':

         return 'out'

     elif user_input == 'a':

         return 'pay'

     else:

         print("wrong input!!!\n")

         return 'wrong'

 def money_judge(money,user_backpak):#付款时金额是否足够

     all_cost = 0

     for Type_name in user_backpak.keys():

         all_cost += user_backpak[Type_name][1]

     if money >= all_cost:

         print("You pay successfully!!!\n")

         return money - all_cost

     else:

         print("You don't have enough money!!!\n")

         return -1

 def show_now(user_bakpak,user_mon):#显示现在背包内容以及现有钱数

     print "you bakpak have:",user_bakpak

     print "your mony:",user_mon

 if __name__ == '__main__':

     user_backpak = {}

     user_mon = 1000

     while True:

         show_meu(meu_list_1)#显示菜单1

         show_meu(meu_list_2)#显示菜单2

         show_now(user_backpak,user_mon)#显示当前背包状态和钱数

         input_judge_num = input_judge()

         if input_judge_num == 'pay':#用户若选择付款

             if user_backpak == {}:#查看背包是否为空

                 print("backpak is empty!!!\n")

                 continue

             else:#背包不为空

                 money_judge_num = money_judge(user_mon,user_backpak)#判断钱够不够

                 if money_judge_num == -1:#钱不够

                     continue

                 else:#钱足够 付款成功 减少钱数 清空背包

                     user_mon = money_judge_num

                     user_backpak.clear()

                     continue

         if input_judge_num == 'out':#退出判断

             break

         elif input_judge_num == 'wrong':#错误输入判断

             continue

         else:#正确选取了商品

             user_choice = meu_list_1.keys()[input_judge_num]#获取商品名称

             user_cost = meu_list_1[user_choice]#获取商品钱数

             if user_choice in user_backpak:#若当前选择的商品在背包中 商品数量加1

                 user_backpak[user_choice][0] += 1

             else:#若当前选择的商品不在背包中 就添加该商品。 格式，商品：[数量，总价]

                 user_backpak[user_choice] = [1,0]

             user_backpak[user_choice][1] = user_backpak[user_choice][0]*user_cost#商品总价