Python demo

demo.py

class Person:
    def __init__(self, name, age):
        self.name = name
        self.age = age

    def say_hello(self):
        """Say hello to the user."""
        print(f"Hello, {self.name}.")


class Man(Person):
    gender = 'male'


class Woman(Person):
    gender = 'female'

mat = Man('Mat', 28)
caitlin = Woman('Caitlin', 27)

print("Caitlin is a {}".format(caitlin.gender))
print("Mat is a {}".format(mat.gender))
mat.say_hello()