PYTHON OOP #5 - POLYMORPHISM | BAHASA INDONESIA

Summary

In this video, the concept of polymorphism in object-oriented programming is explained using Python. The speaker demonstrates how polymorphism allows different classes to have methods with the same name but different behaviors, such as in the cases of a television and air conditioner class. Additionally, the video covers how polymorphism enables method customization, like overriding the `append` method in a custom list class. The speaker emphasizes the utility of polymorphism in making code more flexible and adaptable to varying requirements. Viewers are encouraged to ask questions if they have further doubts.

Takeaways

• 😀 Polymorphism in object-oriented programming (OOP) refers to having multiple forms or behaviors for the same method or function.
• 😀 The term 'polymorphism' is derived from 'poly' (many) and 'morphism' (form), meaning 'many forms'.
• 😀 An example of polymorphism is having multiple classes (e.g., TV and AC) with the same method name (e.g., 'turnOn') but different behaviors.
• 😀 In the example, when the 'turnOn' method is called on a TV object, it turns on the TV, while calling it on an AC object turns on the air conditioner.
• 😀 Polymorphism allows methods to have different implementations depending on the class, even if the method name is the same.
• 😀 Another example involves subclassing Python's built-in list class, where a custom list class can modify the behavior of methods like 'append'.
• 😀 This demonstrates that polymorphism can also apply to built-in classes in Python, allowing for customized behavior in inherited methods.
• 😀 Polymorphism is particularly useful for flexibility in code, enabling the modification of certain methods without altering the entire class structure.
• 😀 The concept of polymorphism makes it easier to design classes where some methods retain their default functionality, while others can be adjusted for specific needs.
• 😀 The overall benefit of polymorphism is making the code more reusable and adaptable, allowing for diverse behaviors across different objects.

Q & A

What is polymorphism in object-oriented programming?

Polymorphism in object-oriented programming refers to the ability of different classes to define methods with the same name but with different behaviors or implementations. It allows one interface to be used for different types of objects.

How is the concept of polymorphism explained in the video?

In the video, polymorphism is explained as 'many shapes' or 'many forms.' It is illustrated using two classes, one for a television and another for an air conditioner, both of which have a method named 'turnOn' but with different implementations.

What is the example provided for polymorphism with a television and an air conditioner?

The example shows two classes: one for a 'Television' and another for an 'Air Conditioner.' Both have a method called 'turnOn,' but the behavior of these methods is different. The 'turnOn' method in the 'Television' class starts the TV, while in the 'Air Conditioner' class, it turns on the air conditioner.

Can polymorphism be applied to Python's built-in classes?

Yes, polymorphism can be applied to Python's built-in classes. For example, the video demonstrates how to create a custom class 'ImitationList' that inherits from Python’s built-in 'list' class and overrides the 'append' method to modify its behavior.

What is the purpose of overriding the 'append' method in the 'ImitationList' class?

The purpose of overriding the 'append' method in the 'ImitationList' class is to demonstrate polymorphism by altering the default behavior of the 'append' method from the list class. This allows the 'ImitationList' class to have its own implementation of 'append,' which is different from the original list.

How does polymorphism improve code flexibility?

Polymorphism improves code flexibility by allowing classes to implement the same method names in different ways. This enables developers to write more generic and reusable code while allowing specific behaviors for different classes or objects.

What is the significance of the 'turnOn' method in the provided example?

The 'turnOn' method in the provided example is significant because it highlights how polymorphism works in practice. Even though the method has the same name in both the 'Television' and 'Air Conditioner' classes, it performs different actions depending on the class instance.

Why is polymorphism important for object-oriented programming?

Polymorphism is important in object-oriented programming because it allows for more efficient and maintainable code. It makes it easier to extend and modify behavior without changing the interface, thus enhancing code reusability and scalability.

What can be learned from the polymorphism example involving the 'ImitationList' class?

The polymorphism example involving the 'ImitationList' class teaches that you can modify or override the behavior of methods in inherited classes, thus tailoring them to meet specific needs or behaviors while maintaining the same interface.

What is the main takeaway regarding polymorphism from this video?

The main takeaway from the video is that polymorphism allows for the creation of flexible and scalable object-oriented code by enabling different classes to define methods with the same name but different implementations, making the code easier to manage and extend.