Day4_python(购物车代码)

# Welcome Python
sale=0#消费金额
product_list=[
      ('苹果',100),
      ('红苹果',200),
      ('青苹果',150),
      ('香蕉',100),
      ('小番茄',80),
  ]
#商品列表
shop_car = []
#购物车
salary = input("你带了多少钱:")
if salary.isdigit():
      salary = int (salary)
      salary1 = salary
      while True:

          #for item in product_list:
          for index,item in enumerate(product_list):
              #print(product_list.index(item),item)
              print(index,item)
          user_choice=input("选择要买的水果【q】:")
          if user_choice.isdigit():
                  user_choice=int(user_choice)
                  if user_choice < len(product_list) and user_choice>=0:
                      p_item=product_list[user_choice]
                      if p_item[1]<= salary:
                          shop_car.append(p_item)
                          salary-=p_item[1]
                          sale+=p_item[1]
                          print("添加 %s 进购物车,你的余额为 \033[31;1m%s\033[0m"%(p_item,salary))
                      else:
                          print("\033[41;1m余额不足，剩余[%s]\033[0m"%salary)
                  else:
                      print("选择的[%s]商品不存在!"%user_choice)
          elif user_choice == 'q':
                    print("------已购买商品-------")
                    for p in shop_car:
                        print(p)
                    print("您一共需要支付",sale,'元',"收您",salary1,"元","找您：",salary,'元')

                    exit()
          else:
             print("请输入商品序号")
else:
      print("请正确输入工资")