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Introduction to OOP in python inheritance
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.
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Introduction to OOP in python inheritance
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- 2. Today’s Goals 1. Provide an introduction to inheritance in OOP. • Whyand when should we inherit from other objects? • How do we inherit from objects in Python? 2. Provide an introduction to method overriding.
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- 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.
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- 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 studentat 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 Studentat 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.