Method overriding

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Method overriding is a key feature of object-oriented programming (OOP) and inheritance. It allows a subclass (child class) to provide its own specific implementation of a method that is already defined in its superclass (parent class).

When a method is called on an object of the child class, the child’s version of the method is executed instead of the parent’s version.


Simple Example ๐Ÿพ

Let’s consider a parent class Animal with a method speak(). Different animals make different sounds, so we can create child classes like Dog and Cat that override the generic speak() method.

Python

# 1. Parent Class (Superclass)
class Animal:
    def speak(self):
        print("The animal makes a sound.")

# 2. Child Class (Subclass) that inherits from Animal
class Dog(Animal):
    # Overriding the parent's speak() method
    def speak(self):
        print("The dog barks: Woof! ๐Ÿถ")

# 3. Another Child Class
class Cat(Animal):
    # Overriding the parent's speak() method
    def speak(self):
        print("The cat meows: Meow! ๐Ÿฑ")

# --- Let's see it in action ---

# Create objects (instances) of each class
generic_animal = Animal()
my_dog = Dog()
my_cat = Cat()

# Call the speak() method on each object
generic_animal.speak()  # Calls the method from the Animal class
my_dog.speak()          # Calls the overridden method from the Dog class
my_cat.speak()          # Calls the overridden method from the Cat class

Output:

The animal makes a sound.
The dog barks: Woof! ๐Ÿถ
The cat meows: Meow! ๐Ÿฑ

Here, Dog and Cat both provide their own versions of speak(), which is why they produce different outputs than the base Animal class.


Extending a Method with super()

Sometimes you don’t want to completely replace the parent’s method but just add more functionality to it. You can do this using the super() function, which allows you to call the parent class’s method from within the child class.

Example:

Python

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

    def work(self):
        print(f"{self.name} starts working.")

class SoftwareDeveloper(Person):
    def work(self):
        # First, call the work() method from the parent (Person) class
        super().work()
        # Then, add the specific functionality for this child class
        print(f"{self.name} writes code. ๐Ÿ’ป")

# --- Let's see it in action ---
dev = SoftwareDeveloper("Alice")
dev.work()

Output:

Alice starts working.
Alice writes code. ๐Ÿ’ป

In this case, the SoftwareDeveloper‘s work() method extends the Person‘s work() method instead of completely replacing it.

“เฐฎเฑ†เฐฅเฐกเฑ เฐ“เฐตเฐฐเฑโ€Œเฐฐเฑˆเฐกเฐฟเฐ‚เฐ—เฑ” เฐ—เฑเฐฐเฐฟเฐ‚เฐšเฐฟเฐจ เฐตเฐฟเฐตเฐฐเฐฃเฐจเฑ เฐคเฑ†เฐฒเฑเฐ—เฑเฐฒเฑ‹ เฐ•เฐฟเฐ‚เฐฆ เฐ‡เฐšเฑเฐšเฐพเฐจเฑ.

เฐฎเฑ†เฐฅเฐกเฑ เฐ“เฐตเฐฐเฑโ€Œเฐฐเฑˆเฐกเฐฟเฐ‚เฐ—เฑ (Method Overriding) เฐ…เฐจเฑ‡เฐฆเฐฟ เฐ†เฐฌเฑเฐœเฑ†เฐ•เฑเฐŸเฑ-เฐ“เฐฐเฐฟเฐฏเฑ†เฐ‚เฐŸเฑ†เฐกเฑ เฐชเฑเฐฐเฑ‹เฐ—เฑเฐฐเฐพเฐฎเฐฟเฐ‚เฐ—เฑ (OOP) เฐฎเฐฐเฐฟเฐฏเฑ เฐ‡เฐจเฑเฐนเฑ†เฐฐเฐฟเฐŸเฑ†เฐจเฑเฐธเฑ (Inheritance) เฐฏเฑŠเฐ•เฑเฐ• เฐ’เฐ• เฐฎเฑเฐ–เฑเฐฏเฐฎเฑˆเฐจ เฐฒเฐ•เฑเฐทเฐฃเฐ‚. เฐ‡เฐฆเฐฟ เฐ’เฐ• เฐธเฐฌเฑโ€Œเฐ•เฑเฐฒเฐพเฐธเฑ (เฐšเฑˆเฐฒเฑเฐกเฑ เฐ•เฑเฐฒเฐพเฐธเฑ) เฐคเฐจ เฐธเฑ‚เฐชเฐฐเฑโ€Œเฐ•เฑเฐฒเฐพเฐธเฑ (เฐชเฑ‡เฐฐเฑ†เฐ‚เฐŸเฑ เฐ•เฑเฐฒเฐพเฐธเฑ)เฐฒเฑ‹ เฐ‡เฐชเฑเฐชเฐŸเฐฟเฐ•เฑ‡ เฐกเฐฟเฐซเฑˆเฐจเฑ เฐšเฑ‡เฐฏเฐฌเฐกเฐฟเฐจ เฐ’เฐ• เฐฎเฑ†เฐฅเฐกเฑโ€Œเฐ•เฑ เฐคเฐจ เฐธเฑเฐตเฐ‚เฐค เฐจเฐฟเฐฐเฑเฐฆเฐฟเฐทเฑเฐŸเฐฎเฑˆเฐจ เฐ‡เฐ‚เฐชเฑเฐฒเฐฟเฐฎเฑ†เฐ‚เฐŸเฑ‡เฐทเฐจเฑโ€Œเฐจเฑ เฐ…เฐ‚เฐฆเฐฟเฐ‚เฐšเฐกเฐพเฐจเฐฟเฐ•เฐฟ เฐ…เฐจเฑเฐฎเฐคเฐฟเฐธเฑเฐคเฑเฐ‚เฐฆเฐฟ.

เฐšเฑˆเฐฒเฑเฐกเฑ เฐ•เฑเฐฒเฐพเฐธเฑ เฐฏเฑŠเฐ•เฑเฐ• เฐ†เฐฌเฑเฐœเฑ†เฐ•เฑเฐŸเฑโ€Œเฐชเฑˆ เฐ’เฐ• เฐฎเฑ†เฐฅเฐกเฑ เฐ•เฐพเฐฒเฑ เฐšเฑ‡เฐฏเฐฌเฐกเฐฟเฐจเฐชเฑเฐชเฑเฐกเฑ, เฐชเฑ‡เฐฐเฑ†เฐ‚เฐŸเฑ เฐตเฑ†เฐฐเฑเฐทเฐจเฑโ€Œเฐ•เฑ เฐฌเฐฆเฑเฐฒเฑเฐ—เฐพ เฐšเฑˆเฐฒเฑเฐกเฑ เฐฏเฑŠเฐ•เฑเฐ• เฐตเฑ†เฐฐเฑเฐทเฐจเฑ เฐฎเฑ†เฐฅเฐกเฑ เฐŽเฐ—เฑเฐœเฐฟเฐ•เฑเฐฏเฑ‚เฐŸเฑ เฐ…เฐตเฑเฐคเฑเฐ‚เฐฆเฐฟ.


เฐธเฐพเฐงเฐพเฐฐเฐฃ เฐ‰เฐฆเฐพเฐนเฐฐเฐฃ ๐Ÿพ

speak() เฐ…เฐจเฑ‡ เฐฎเฑ†เฐฅเฐกเฑ เฐ‰เฐจเฑเฐจ Animal เฐ…เฐจเฑ‡ เฐชเฑ‡เฐฐเฑ†เฐ‚เฐŸเฑ เฐ•เฑเฐฒเฐพเฐธเฑโ€Œเฐจเฑ เฐชเฐฐเฐฟเฐ—เฐฃเฐฟเฐฆเฑเฐฆเฐพเฐ‚. เฐตเฑ‡เฐฐเฑเฐตเฑ‡เฐฐเฑ เฐœเฐ‚เฐคเฑเฐตเฑเฐฒเฑ เฐตเฑ‡เฐฐเฑเฐตเฑ‡เฐฐเฑ เฐถเฐฌเฑเฐฆเฐพเฐฒเฑ เฐšเฑ‡เฐธเฑเฐคเฐพเฐฏเฐฟ, เฐ•เฐพเฐฌเฐŸเฑเฐŸเฐฟ เฐฎเฐจเฐ‚ Dog เฐฎเฐฐเฐฟเฐฏเฑ Cat เฐตเฐ‚เฐŸเฐฟ เฐšเฑˆเฐฒเฑเฐกเฑ เฐ•เฑเฐฒเฐพเฐธเฑโ€Œเฐฒเฐจเฑ เฐธเฑƒเฐทเฑเฐŸเฐฟเฐ‚เฐšเฐฟ, เฐธเฐพเฐงเฐพเฐฐเฐฃ speak() เฐฎเฑ†เฐฅเฐกเฑโ€Œเฐจเฑ เฐ“เฐตเฐฐเฑโ€Œเฐฐเฑˆเฐกเฑ เฐšเฑ‡เฐฏเฐตเฐšเฑเฐšเฑ.

Python

# 1. เฐชเฑ‡เฐฐเฑ†เฐ‚เฐŸเฑ เฐ•เฑเฐฒเฐพเฐธเฑ (เฐธเฑ‚เฐชเฐฐเฑโ€Œเฐ•เฑเฐฒเฐพเฐธเฑ)
class Animal:
    def speak(self):
        print("เฐœเฐ‚เฐคเฑเฐตเฑ เฐ’เฐ• เฐถเฐฌเฑเฐฆเฐ‚ เฐšเฑ‡เฐธเฑเฐคเฑเฐ‚เฐฆเฐฟ.")

# 2. Animal เฐจเฑเฐ‚เฐกเฐฟ เฐ‡เฐจเฑเฐนเฑ†เฐฐเฐฟเฐŸเฑ เฐšเฑ‡เฐธเฑเฐ•เฑเฐจเฑ‡ เฐšเฑˆเฐฒเฑเฐกเฑ เฐ•เฑเฐฒเฐพเฐธเฑ (เฐธเฐฌเฑโ€Œเฐ•เฑเฐฒเฐพเฐธเฑ)
class Dog(Animal):
    # เฐชเฑ‡เฐฐเฑ†เฐ‚เฐŸเฑ เฐฏเฑŠเฐ•เฑเฐ• speak() เฐฎเฑ†เฐฅเฐกเฑโ€Œเฐจเฑ เฐ“เฐตเฐฐเฑโ€Œเฐฐเฑˆเฐกเฑ เฐšเฑ‡เฐฏเฐกเฐ‚
    def speak(self):
        print("เฐ•เฑเฐ•เฑเฐ• เฐฎเฑŠเฐฐเฑเฐ—เฑเฐคเฑเฐ‚เฐฆเฐฟ: เฐญเฑŒ! เฐญเฑŒ! ๐Ÿถ")

# 3. เฐฎเฐฐเฑŠเฐ• เฐšเฑˆเฐฒเฑเฐกเฑ เฐ•เฑเฐฒเฐพเฐธเฑ
class Cat(Animal):
    # เฐชเฑ‡เฐฐเฑ†เฐ‚เฐŸเฑ เฐฏเฑŠเฐ•เฑเฐ• speak() เฐฎเฑ†เฐฅเฐกเฑโ€Œเฐจเฑ เฐ“เฐตเฐฐเฑโ€Œเฐฐเฑˆเฐกเฑ เฐšเฑ‡เฐฏเฐกเฐ‚
    def speak(self):
        print("เฐชเฐฟเฐฒเฑเฐฒเฐฟ เฐ…เฐฐเฑเฐธเฑเฐคเฑเฐ‚เฐฆเฐฟ: เฐฎเฑเฐฏเฐพเฐตเฑ! ๐Ÿฑ")

# --- เฐ‡เฐฆเฐฟ เฐŽเฐฒเฐพ เฐชเฐจเฐฟเฐšเฑ‡เฐธเฑเฐคเฑเฐ‚เฐฆเฑ‹ เฐšเฑ‚เฐฆเฑเฐฆเฐพเฐ‚ ---

# เฐชเฑเฐฐเฐคเฐฟ เฐ•เฑเฐฒเฐพเฐธเฑ เฐฏเฑŠเฐ•เฑเฐ• เฐ†เฐฌเฑเฐœเฑ†เฐ•เฑเฐŸเฑโ€Œเฐฒเฐจเฑ (เฐ‡เฐจเฑโ€ŒเฐธเฑเฐŸเฐพเฐจเฑเฐธเฑโ€Œเฐฒเฐจเฑ) เฐ•เฑเฐฐเฐฟเฐฏเฑ‡เฐŸเฑ เฐšเฑ‡เฐฏเฐ‚เฐกเฐฟ
generic_animal = Animal()
my_dog = Dog()
my_cat = Cat()

# เฐชเฑเฐฐเฐคเฐฟ เฐ†เฐฌเฑเฐœเฑ†เฐ•เฑเฐŸเฑโ€Œเฐชเฑˆ speak() เฐฎเฑ†เฐฅเฐกเฑโ€Œเฐจเฑ เฐ•เฐพเฐฒเฑ เฐšเฑ‡เฐฏเฐ‚เฐกเฐฟ
generic_animal.speak()  # Animal เฐ•เฑเฐฒเฐพเฐธเฑ เฐจเฑเฐ‚เฐกเฐฟ เฐฎเฑ†เฐฅเฐกเฑโ€Œเฐจเฑ เฐ•เฐพเฐฒเฑ เฐšเฑ‡เฐธเฑเฐคเฑเฐ‚เฐฆเฐฟ
my_dog.speak()          # Dog เฐ•เฑเฐฒเฐพเฐธเฑ เฐจเฑเฐ‚เฐกเฐฟ เฐ“เฐตเฐฐเฑโ€Œเฐฐเฑˆเฐกเฑ เฐšเฑ‡เฐฏเฐฌเฐกเฐฟเฐจ เฐฎเฑ†เฐฅเฐกเฑโ€Œเฐจเฑ เฐ•เฐพเฐฒเฑ เฐšเฑ‡เฐธเฑเฐคเฑเฐ‚เฐฆเฐฟ
my_cat.speak()          # Cat เฐ•เฑเฐฒเฐพเฐธเฑ เฐจเฑเฐ‚เฐกเฐฟ เฐ“เฐตเฐฐเฑโ€Œเฐฐเฑˆเฐกเฑ เฐšเฑ‡เฐฏเฐฌเฐกเฐฟเฐจ เฐฎเฑ†เฐฅเฐกเฑโ€Œเฐจเฑ เฐ•เฐพเฐฒเฑ เฐšเฑ‡เฐธเฑเฐคเฑเฐ‚เฐฆเฐฟ

เฐซเฐฒเฐฟเฐคเฐ‚ (Output):

เฐœเฐ‚เฐคเฑเฐตเฑ เฐ’เฐ• เฐถเฐฌเฑเฐฆเฐ‚ เฐšเฑ‡เฐธเฑเฐคเฑเฐ‚เฐฆเฐฟ.
เฐ•เฑเฐ•เฑเฐ• เฐฎเฑŠเฐฐเฑเฐ—เฑเฐคเฑเฐ‚เฐฆเฐฟ: เฐญเฑŒ! เฐญเฑŒ! ๐Ÿถ
เฐชเฐฟเฐฒเฑเฐฒเฐฟ เฐ…เฐฐเฑเฐธเฑเฐคเฑเฐ‚เฐฆเฐฟ: เฐฎเฑเฐฏเฐพเฐตเฑ! ๐Ÿฑ

เฐ‡เฐ•เฑเฐ•เฐก, Dog เฐฎเฐฐเฐฟเฐฏเฑ Cat เฐฐเฑ†เฐ‚เฐกเฑ‚ speak() เฐฏเฑŠเฐ•เฑเฐ• เฐธเฑŠเฐ‚เฐค เฐตเฑ†เฐฐเฑเฐทเฐจเฑเฐฒเฐจเฑ เฐ…เฐ‚เฐฆเฐฟเฐธเฑเฐคเฐพเฐฏเฐฟ, เฐ…เฐ‚เฐฆเฑเฐ•เฑ‡ เฐ…เฐตเฐฟ เฐฌเฑ‡เฐธเฑ Animal เฐ•เฑเฐฒเฐพเฐธเฑ เฐ•เฐ‚เฐŸเฑ‡ เฐญเฐฟเฐจเฑเฐจเฐฎเฑˆเฐจ เฐ…เฐตเฑเฐŸเฑโ€ŒเฐชเฑเฐŸเฑโ€Œเฐฒเฐจเฑ เฐ‡เฐธเฑเฐคเฐพเฐฏเฐฟ.


super() เฐคเฑ‹ เฐฎเฑ†เฐฅเฐกเฑโ€Œเฐจเฑ เฐตเฐฟเฐธเฑเฐคเฐฐเฐฟเฐ‚เฐšเฐกเฐ‚

เฐ•เฑŠเฐจเฑเฐจเฐฟเฐธเฐพเฐฐเฑเฐฒเฑ เฐฎเฑ€เฐฐเฑ เฐชเฑ‡เฐฐเฑ†เฐ‚เฐŸเฑ เฐฎเฑ†เฐฅเฐกเฑโ€Œเฐจเฑ เฐชเฑ‚เฐฐเฑเฐคเฐฟเฐ—เฐพ เฐญเฐฐเฑเฐคเฑ€ เฐšเฑ‡เฐฏเฐ•เฑเฐ‚เฐกเฐพ, เฐฆเฐพเฐจเฐฟเฐ•เฐฟ เฐฎเฐฐเฐฟเฐ•เฑŠเฐ‚เฐค เฐ•เฐพเฐฐเฑเฐฏเฐพเฐšเฐฐเฐฃเฐจเฑ เฐœเฑ‹เฐกเฐฟเฐ‚เฐšเฐพเฐฒเฐจเฑเฐ•เฑ‹เฐตเฐšเฑเฐšเฑ. super() เฐซเฐ‚เฐ•เฑเฐทเฐจเฑโ€Œเฐจเฑ เฐ‰เฐชเฐฏเฑ‹เฐ—เฐฟเฐ‚เฐšเฐฟ เฐฎเฑ€เฐฐเฑ เฐฆเฑ€เฐจเฑเฐจเฐฟ เฐšเฑ‡เฐฏเฐตเฐšเฑเฐšเฑ, เฐ‡เฐฆเฐฟ เฐšเฑˆเฐฒเฑเฐกเฑ เฐ•เฑเฐฒเฐพเฐธเฑโ€Œเฐฒเฑ‹ เฎ‡เฎฐเฏเฎจเฏเฎคเฏ เฐชเฑ‡เฐฐเฑ†เฐ‚เฐŸเฑ เฐ•เฑเฐฒเฐพเฐธเฑ เฐฏเฑŠเฐ•เฑเฐ• เฐฎเฑ†เฐฅเฐกเฑโ€Œเฐจเฑ เฐ•เฐพเฐฒเฑ เฐšเฑ‡เฐฏเฐกเฐพเฐจเฐฟเฐ•เฐฟ เฐฎเฐฟเฐฎเฑเฐฎเฐฒเฑเฐจเฐฟ เฐ…เฐจเฑเฐฎเฐคเฐฟเฐธเฑเฐคเฑเฐ‚เฐฆเฐฟ.

เฐ‰เฐฆเฐพเฐนเฐฐเฐฃ:

Python

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

    def work(self):
        print(f"{self.name} เฐชเฐจเฐฟ เฐšเฑ‡เฐฏเฐกเฐ‚ เฐชเฑเฐฐเฐพเฐฐเฐ‚เฐญเฐฟเฐธเฑเฐคเฐพเฐฐเฑ.")

class SoftwareDeveloper(Person):
    def work(self):
        # เฐฎเฑŠเฐฆเฐŸ, เฐชเฑ‡เฐฐเฑ†เฐ‚เฐŸเฑ (Person) เฐ•เฑเฐฒเฐพเฐธเฑ เฐจเฑเฐ‚เฐกเฐฟ work() เฐฎเฑ†เฐฅเฐกเฑโ€Œเฐจเฑ เฐ•เฐพเฐฒเฑ เฐšเฑ‡เฐฏเฐ‚เฐกเฐฟ
        super().work()
        # เฐ† เฐคเฐฐเฑเฐตเฐพเฐค, เฐˆ เฐšเฑˆเฐฒเฑเฐกเฑ เฐ•เฑเฐฒเฐพเฐธเฑ เฐ•เฑ‹เฐธเฐ‚ เฐชเฑเฐฐเฐคเฑเฐฏเฑ‡เฐ• เฐ•เฐพเฐฐเฑเฐฏเฐพเฐšเฐฐเฐฃเฐจเฑ เฐœเฑ‹เฐกเฐฟเฐ‚เฐšเฐ‚เฐกเฐฟ
        print(f"{self.name} เฐ•เฑ‹เฐกเฑ เฐตเฑเฐฐเฐพเฐธเฑเฐคเฐพเฐฐเฑ. ๐Ÿ’ป")

# --- เฐ‡เฐฆเฐฟ เฐŽเฐฒเฐพ เฐชเฐจเฐฟเฐšเฑ‡เฐธเฑเฐคเฑเฐ‚เฐฆเฑ‹ เฐšเฑ‚เฐฆเฑเฐฆเฐพเฐ‚ ---
dev = SoftwareDeveloper("เฐ†เฐฒเฐฟเฐธเฑ")
dev.work()

เฐซเฐฒเฐฟเฐคเฐ‚ (Output):

เฐ†เฐฒเฐฟเฐธเฑ เฐชเฐจเฐฟ เฐšเฑ‡เฐฏเฐกเฐ‚ เฐชเฑเฐฐเฐพเฐฐเฐ‚เฐญเฐฟเฐธเฑเฐคเฐพเฐฐเฑ.
เฐ†เฐฒเฐฟเฐธเฑ เฐ•เฑ‹เฐกเฑ เฐตเฑเฐฐเฐพเฐธเฑเฐคเฐพเฐฐเฑ. ๐Ÿ’ป

เฐˆ เฐธเฐ‚เฐฆเฐฐเฑเฐญเฐ‚เฐฒเฑ‹, SoftwareDeveloper เฐฏเฑŠเฐ•เฑเฐ• work() เฐฎเฑ†เฐฅเฐกเฑ, Person เฐฏเฑŠเฐ•เฑเฐ• work() เฐฎเฑ†เฐฅเฐกเฑโ€Œเฐจเฑ เฐชเฑ‚เฐฐเฑเฐคเฐฟเฐ—เฐพ เฐญเฐฐเฑเฐคเฑ€ เฐšเฑ‡เฐฏเฐกเฐพเฐจเฐฟเฐ•เฐฟ เฐฌเฐฆเฑเฐฒเฑเฐ—เฐพ เฐฆเฐพเฐจเฐฟเฐจเฐฟ เฐตเฐฟเฐธเฑเฐคเฐฐเฐฟเฐธเฑเฐคเฑเฐ‚เฐฆเฐฟ.

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  • append(),ย extend(), andย insert()ย methods in Python lists

    append(), extend(), and insert() methods in Python lists, along with slicing where applicable. 1. append() Method Adds a single element to the end of the list. Examples: 2. extend() Method Adds multiple elements (iterable items) to the end of the list. Examples: 3. insert() Method Inserts an element at a specific position. Examples: Key Differences: Method Modifies List? Adds Single/Multiple Elements? Position append() โœ… Yes Single element (even if it’s a list) End…

  • ย List Comprehensionsย 

    List Comprehensions in Python (Basic) with Examples List comprehensions provide a concise way to create lists in Python. They are more readable and often faster than using loops. Basic Syntax: python [expression for item in iterable if condition] Example 1: Simple List Comprehension Create a list of squares from 0 to 9. Using Loop: python…

  • What is list

    In Python, a list is a built-in data structure that represents an ordered, mutable (changeable), and heterogeneous (can contain different data types) collection of elements. Lists are one of the most commonly used data structures in Python due to their flexibility and dynamic nature. Definition of a List in Python: Example: python my_list = [1, “hello”, 3.14,…

  • Polymorphism

    Polymorphism is a core concept in OOP that means “many forms” ๐Ÿ. In Python, it allows objects of different classes to be treated as objects of a common superclass. This means you can use a single function or method to work with different data types, as long as they implement a specific action. ๐ŸŒ€ Polymorphism…

  • break and continue

    In Python, break and continue are loop control statements. They allow you to alter the standard flow of a loop (whether a for loop or a while loop) based on specific conditions. Here is a detailed breakdown of how each statement works, along with examples. The break Statement The break statement is used to completely…

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