实验五

class StudentDoc:
    def __init__(self,studentsnumber,name,major,point)：
       self._studentsnumber=studentsnumber
       self._name=name
       self._major=major
       self._point=point
    def info(self):
        print(f'{self._studentsnumber},{self._name},{self._major}')

    def get_balance(self):
        return self._balance

    def change_point(self,newpoint):
        self._point=newpoint
        return newpoint
s1=StudentDoc('1','22','333','0')
s1.change_point(100)
s1.info()