#先输入金额，然后通过商品编号购买，退出后有购物结算
Product = [
    ('Pen',5),
    ('Apple*3',10),
    ('Phone',3000),
    ('Fan',50),
    ('Ball',130),
]
Shopping_list = []
while True:
    Salary = input('请输入你现有的钱：')
    if Salary.isdigit():
        Salary = float(Salary)
        while True:
            for num,x in enumerate(Product):
                print(num,x)
            Pro_num = input('请输入商品编号(按q可退出):')
            if Pro_num.isdigit():
                Pro_num = int(Pro_num)
                if 0 <= Pro_num < len(Product):
                    Pro_item = Product[Pro_num]
                    if Salary >= Pro_item[1]:
                        Shopping_list.append(Pro_item)
                        Salary -= Pro_item[1]
                        print('商品%s已购买，你的余额为%s'%(Pro_item,Salary))
                    else:
                        print('余额不足，请选择其他商品,当前余额为:%s'%Salary)
                else:
                    print('无此商品编号，请重试！\n')
            elif Pro_num == 'q':
                print('\n-----你的购物单如下------')
                for x in Shopping_list:
                    print(x)
                print('工资余额：%s'%Salary)
                print('-------谢谢惠顾---------')
                exit()
            else:
                print('无效的商品编号!')
    else:
        print('无效的输入,请输入数字！\n')


'''

#使List的起始下标为1
L = [15,64,16,78,384,1468]
for num,x in enumerate(L,1):
　　print(num,x)

'''