demo_inheritance_add_prop.py:
class Person: def __init__(self, fname, lname): self.firstname = fname self.lastname = lname def printname(self): print(self.firstname, self.lastname) class Student(Person): def __init__(self, fname, lname): super().__init__(fname, lname) self.graduationyear = 2019 x = Student("Mike", "Olsen") print(x.graduationyear)
C:\Users\My Name>python demo_inheritance_add_prop.py
2019