Inheritance

class Student:
    def __init__(self, name, school):
        self.name = name
        self.school = school
        self.marks = []

    def avarage(self):
        return sum(self.marks / len(self.marks))

    @classmethod
    def friend(cls, origin, friend_name, *args, **kwargs):
        return cls(friend_name, origin.school,*args,**kwargs)

##

class WorkingStudent(Student):
    def __init__(self, name, school, salary, job_title):
        super().__init__(name, school)
        self.salary = salary
        self.job_title = job_title

anna = WorkingStudent("Anna", "Oxford", 20.00, "Software Developer")
print(anna.salary)
friend = WorkingStudent.friend(anna, "Greg", 17.50, job_title="Software Developer")
print(friend.name)
print(friend.school)
print(friend.salary)