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Linear Algebra
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# Python | Child Classes

schedule Mar 5, 2023
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We can create a new class based on an already existing class. The new class, referred to as the child class, will inherit all attributes and methods from the existing class, referred to as the parent class. In addition, we can define additional attributes and methods that are specific to the child class.

# Example

To create a child class `Dog` based on the parent class `Animal`:

``` class Animal(): # This is constructor for python def __init__(self, name, age): self.name = name def print_attribute(self): print("I have legs!")class Dog(Animal): # Name of the parent class must be included within the brackets # This is constructor for python def __init__(self, name, age): super().__init__(name, age) # Notice how we do not need self parameter here # Method specific to the Dog class def speak(self): print("I am a " + str(self.age) + " year old " + self.name)my_dog = Dog("Roxas", 26) my_dog.print_attribute() I have legs! ```

The `super()` method allows us to reference a temporary object of the parent class. Therefore, when we initialize an object from class `Dog`, we are actually calling the `__init__` constructor from class `Animal`.

NOTE

The advantage of `super()` is that it allows us to avoid explicitly referring to the parent class. Therefore, we can easily change the parent class name if needed without disrupting our program.

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