Introduction to OOP in python inheritance
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This document discusses object-oriented programming concepts in Python including inheritance and method overriding. It provides examples of using inheritance to create child classes that inherit attributes and behaviors from a parent class. Method overriding is described as allowing a subclass to provide a different implementation of a method already defined in the superclass. The document includes code examples demonstrating inheritance and method overriding in Python.
Introduction to OOP in python inheritance
- 2. Today’s Goals 1. Provide an introduction to inheritance in OOP. • Why and when should we inherit from other objects? • How do we inherit from objects in Python? 2. Provide an introduction to method overriding.
- 7. Inheritance • Inheritance simplifies our code through reuse of the code that has been already written. • Think about the Taxi and Bus, and what they have in common. • Inheritance is a relation between a parent class (e.g. Vehicle) and children classes (e.g. Taxi, Bus, Truck, etc.) • A class inherits attributes and behavior methods from its parent classes.
- 11. OOP Inheritance in Python 1. Create a parent class (e.g. Vehicle) with the common attributes and common methods. 2. Create child classes (e.g. Bus and Taxi) with the extended attributes and extended methods. • Pass the class definition to the child (e.g. Class Bus(Vehicle): …) • Use the parent attributes and methods through super().
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- 17. Exercise time! Model the following problem in Python code: • Frida Jacobsson is a student at MAH. Her Skype nickname is frida96. • Aleksander Fabijan is a researcher at MAH. He teaches DA712 and DA374. • They are both Humans.
- 18. Exercise time! Model the following problem in Python code: • Frida Jacobsson is a Student at MAH. Her Skype nickname is frida96. • Aleksander is a Researcher at MAH. He teaches DA712 and DA374. • They are both Humans. Suggestion: 1) Create a class Human that initiates a new human with a name. 2) Next, create two classes (e.g. Student and Researcher) that inherit from human, 3) Finally, add the skype nickname and the list of courses to the new classes. Code snippets for help: • class Taxi(Vehicle): #creates a child class from Human • super().__init__(name, lastname) #calls the parent’s __init__method
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- 24. Exercise Time Part1: Update your class Human with a __str__ method that can be used on print. It should return the name and lastname of the human. Try it out by creating one human in code. Part2: Update your class student and class researcher by overriding the __str__ method. • __str__ in the child classes should use super().__str__(args) to call its parent method to print out the name and lastname. Part3: For student, override the __str__(args) method so it returns in addition to the name and lastname, also the skype nickname. Do the same for the researcher with his phone extension.
- 25. Takeaways Today, we learned how and when to use inheritance in python OOP. • Whenever our classes can reuse the attributes and methods from parent classes. • We inherit from parent classes by passing their name as a parameter to our child class. • We reuse the methods and attributes from parent classes by using super(). We also learned how to override methods in python.