购物车

product_list = [
    ('iphone6s',5800),
    ('kindle',800),
    ('tesla', 900000),
    ('python book', 105),
    ('bike',2000),
]

wages = input('请输入工资：')
a = []

if wages.isdecimal():
     wages=int(wages)
     while True:
     #打印商品
         for i,v in enumerate(product_list,1):
            print(i,'>>>>>',v)

         commodity = input('选择商品编号[退出:q]:')

         if commodity.isdecimal():
             commodity=int(commodity)

             if commodity > 0 and commodity <= len(product_list):
                 a_name = product_list[commodity-1]
                 if a_name[1]<wages:
                     wages-=a_name[1]
                     a.append(a_name)
                 else:
                     print('余额不足，还剩%s'%wages)
                 print(wages)


             else:
                  print('编码不存在')
         elif commodity == 'q':
             print('----------您购买如下商品----------')
             tag = 0
             for i in a:
                 t = a.count(i)
                 if t > 1:
                     tag +=1
                     if tag > 1 and tag < t:
                         continue
                     elif tag ==t:
                         tag = 0
                         continue
                     else:
                         print(i,'X%d'%t)



             print('您还剩余%s' % wages)
             break

         else:
             print("错误de ")