对于下方代码段的叙述中，正确的是（    ）。

class shopping:
    def __init__(self,name,money):
        self.name = name
        self.money = money
        self.pen = 0
    def buy(self):
        while self.money > 10:
            self.money = self.money-7
            self.pen = self.pen+1
        return self.money
n = int(input())
a = shopping('Xiaoming', n)
print(a.buy())