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Python | Classes

Classes
schedule Jul 1, 2022
Last updated
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A class serves as a general template for creating objects. A class serves to represent real-life things and situations. When we create an object from a class, this is referred to as instantiation.

Example

Below we have a very simple example of a class Cat:

class Cat():
# This is constructor for python
def __init__(self, name, age):
self.name = name
self.age = age
# Teaching each cat how to meow
def meow(self):
print("I am a " + str(self.age) + " year old " + self.name)

# Creating an instance my_cat representing my cat Roxas
my_cat = Cat("Roxas", 26)
my_cat.meow()
I am a 26 year old Roxas

The Cat class above serves as a general template that tries to represent the general attributes and actions of all cats. Using this class we are able to easily create objects that represent ACTUAL cats such as my_cat called Roxas.

NOTE

The convention is for classes to begin with a capital letter in Python.

The self parameter is required in the method definition, and it must come first before the other parameters.

We do not have to pass the self argument when instantiating my_cat as this is passed automatically:

my_cat = Cat("Roxas", 26)

Every method call associated with a class automatically pass the self argument. This is why we did not have to pass the self argument when telling my_cat to meow:

my_cat.meow()
robocat
Published by Arthur Yanagisawa
Edited by 0 others
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