class Student:
    school = '某某大学'
    def __init__(self, name):
        self.name = name

    @classmethod
    def set_school(cls, new_school):
        cls.school = new_school

    @staticmethod
    def get_info():
        return '这是学生类'

s1 = Student('张三')
s2 = Student('李四')
Student.set_school('清华大学')
print(s1.school, s2.school, Student.get_info())