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Having classes that refer to other classes in Python

Classes
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schedule Jul 1, 2022
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We can make one class refer to methods and attributes of another class. This is done by storing an instance of a class as an attribute for another.

Example

In the below example, the class Dog has an attribute that refers to an instance of the Sword class. Every time we call the __init__ method in class Dog, we are automatically creating an instance of the Sword class and storing it in the attribute self.weapon:

class Sword():

def print_weapon(self):
print("I have a sword!")

class Dog():

def __init__(self, name, age):
self.number_of_legs = 4
self.weapon = Sword()
self.name = name
self.age = age

def do_something(self):
self.weapon.print_weapon() #Referring to print_weapon method in Sword

my_dog = Dog("Roxas", 26)
my_dog.do_something()
I have a sword!

This prevents cluttering in our classes, so that we do not actually have to define all the methods and attributes accessible by a class in that class itself, and can draw upon methods and attributes defined in other classes.

robocat
Published by Arthur Yanagisawa
Edited by 0 others
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