购物车

需求
    要求用户输入总资产，例如：2000
    显示商品列表，让用户根据序号选择商品，加入购物车
    购买，如果商品总额大于总资产，提示账户余额不足，否则，购买成功。
    附加：可充值、某商品移除购物车

测试信息
goods = [
    {"name": "电脑", "price": 1999},
    {"name": "鼠标", "price": 10},
    {"name": "游艇", "price": 20},
    {"name": "美女", "price": 998},
]

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goods  =  [      { "name" :  "电脑" ,  "price" :  1999 },      { "name" :  "鼠标" ,  "price" :  10 },      { "name" :  "游艇" ,  "price" :  20 },      { "name" :  "美女" ,  "price" :  998 }, ] # 定义函数，格式化菜单输出 def  menu():      count = 0      for  i  in  goods:          print ( '【{0}】    {1}     {2}' . format (count,i[ 'name' ],i[ 'price' ]))          count + = 1 # 定义购物车空列表 goods_list = [] tag = True while  tag:      money = input ( 'How much are you ?' ).strip()      # 判断输入的数据类型      if  money.isdigit()  and  len (money) ! =  0  :          money  =  int (money)          while  tag:              menu()              choice = input ( '请输入你要购买的商品序号：' ).strip()              if  choice.isdigit()  and  len (choice) ! =  0  :                  choice = int (choice)              if  choice > =  0  and  choice < =  3 :                  # 取出所买商品的信息                  g_l = []                  for  i  in  goods:                      g_l.append({i[ 'name' ]: i[ 'price' ]})                  info = g_l[choice]                  price_list = list (info.values())                  price = int (price_list[ 0 ])                  name_list = list (info.keys())                  # 使用a的值来控制下面两层while循环                  a = 1                  while  a  = =  1 :                      if  money > =  price:                          money = money  -  price                          print ( '商品已加入购物车，当前余额为{}' . format (money))                          goods_list.append(name_list[ 0 ])                          while  a  = =  1 :                              print ( '当前购物车里商品：' ,goods_list)                              choices = input ( ''' 【E】     结账 【D】     删除商品 【S】     继续购买   请选择：''' ).strip().lower()                              if  choices ! =  'e'  and  choices ! =  'd'  and  choices ! =  's' :                                  print ( '选择错误，请重新输入：' )                                  continue                              if  choices  = =  's' :                                  a = 0                                  break                              if  choices  = =  'e' :                                  print ( '已结账，当前余额为{}' . format (money))                                  a = 0                                  tag = False                              if  choices  = =  'd' :                                  print (goods_list)                                  delet = input ( '请输入你想删除的商品：' ).strip()                                  if  delet  in  goods_list:                                      goods_list.remove(delet)                                      print ( '%s 删除成功！'  % delet)                                      continue                                  else :                                      print ( '此商品不在购物车' )                                  continue                        else :                          print ( '你买不起这个,请选择：' )                          choicess = input ( ''' 【A】     重新选择商品 【B】     充值 【C】     退出 请选择：''' ).strip().lower()                          if  choicess  = =  'a' :                              a = 0                          if  choicess  = =  'c' :                              exit()                          while  a  = =  1 :                              if  choicess  = =  'b' :                                  recharge = input ( '请输入充值金额：' ).strip()                                  if  recharge.isdigit()  and  len (recharge) ! =  0 :                                      recharge  =  int (recharge)                                      money  =  money  +  recharge                                      print ( '充值成功，当前金额为：' ,money)                                      break                                  else :                                      print ( '充值金额有误' )                                      continue              else :                  print ( '没有此商品，请重新选择' )                  continue      else :          print ( '你的输入有误,请输入数字：' )          continue 本文转自lyndon博客51CTO博客，原文链接http://blog.51cto.com/lyndon/1947432如需转载请自行联系原作者                                                                                                                                                                            迟到的栋子