Lesson 9. Polymorphism

Lesson Objective

Understand Polymorphism.

Lesson Notes

Polymorphism

Polymorphism, which translates to "many forms," arises when we have multiple classes connected through inheritance.

Inheritance enables the acquisition of attributes and methods from another class.

Polymorphism, in turn, utilizes these inherited methods to carry out alternate but similar tasks. This flexibility permits the execution of a single action in different ways.

Main.py

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

    def valid_age(self):
        if 11 <= self.age <= 16:
            print("Age Valid")
        else:
            print("Age Invalid")

    def get_name(self):
        return self.name

    def set_name(self, name):
        self.name = name

    def get_age(self):
        return self.age

    def set_age(self, age):
        self.age = age


class P16_Student(Student):
    def __init__(self, name, age, ucas):
        super().__init__(name, age)
        self.ucas = ucas

    def valid_age(self):
        if 16 <= self.age <= 19:
            print("Age Valid")
        else:
            print("Age Invalid")

    def get_ucas(self):
        return self.ucas

    def set_ucas(self, ucas):
        self.ucas = ucas


if __name__ == "__main__":
    stu24 = P16_Student("Fei", 17, False)
    print(stu24.get_name(), "is", stu24.get_age())
    print("UCAS complete:", stu24.get_ucas())
    stu24.valid_age()

    stu25 = P16_Student("Bram", 12, False)
    stu25.valid_age()

    stu1 = Student("Bram", 12)
    stu1.valid_age()

Cmd Output:

Fei is 17
UCAS complete: false
Age Valid
Age Invalid
Age Valid

mrahmedcomputing

Lesson 9. Polymorphism

Lesson Objective

Lesson Notes

Polymorphism

Main.py

Cmd Output: