实验5

class StudentDoc:
    def __init__ (self,n,a,m,s):
        self._n=n
        self._a=a
        self._m=m
        self._s=s

    def set(self,s):
        self._s=s

    def date(self):
        print(f'名字: {self._a},学号:{self._n},学术{self._m}.绩点{self._s}')

    def score(self):
        print(f(self._s))