4.py

class univauto:
    def __init__(self):
        self.__sid=None
        self.__age=None
        self.__marks=None
    def validate_marks(self):
        if(self.marks>=0 and self.marks<=100):
            return True
        else:
            return False
    def validate_age(self):
        if(self.age>20):
            return True
        else:
            return False
    def check_qualification(self):
        if(self.marks>=65 and self.age>20):
            return True
        else:
            return False
    def setter(self):
        self.sid=int(input("enter student id"))
        self.age=int(input("enter age"))
        self.marks=int(input("enter marks"))
    def getter(self):
        print("marks- ",self.validate_marks())
        print("age -",self.validate_age())
        print("qualification -" ,self.check_qualification())
ob=univauto()
ob.setter()
ob.getter()