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Python | __init__ constructor

Classes
schedule Jul 1, 2022
Last updated
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Python's __init__ constructor is one of the default methods used for instantiating objects from a class.

Examples

To define a class Cat and instantiate an object from it:

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 self parameter must be provided and it must be provided first in the definition. However, when we instantiate an object, the self argument is automatically passed through hence it does not be provided.

Any variable prefixed with self is available to every method in the class. Hence, in the above example name and age variables are available to every method within class Cat. Variables that are associated with self (i.e. associated with the instance of the class) are referred to as attributes.

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Published by Arthur Yanagisawa
Edited by 0 others
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