What is the use of self in Python

in this article, we discuss What is the use of self in Python

What is the use of self in Python

If you are working with Python, there is no escaping from the word “self”. It is used in method definitions and in variable initialization. The self method is explicitly used every time we define a method. In this article,

  • What is the use of self in Python?
  • Python Class self Constructor
  • Is self in Python a Keyword?

What is the use of Self in Python?

The self is used to represent the instance of the class. With this keyword, you can access the attributes and methods of the class in python. It binds the attributes with the given arguments. The reason why we use self is that Python does not use the ‘@’ syntax to refer to instance attributes. In Python, we have methods that make the instance to be passed automatically, but not received automatically.

Example:

class food():
 
# init method or constructor
def __init__(self, fruit, color):
self.fruit = fruit
self.color = color
 
def show(self):
print("fruit is", self.fruit)
print("color is", self.color )
 
apple = food("apple", "red")
grapes = food("grapes", "green")
 
apple.show()
grapes.show()

Output:

Fruit is apple
color is red
Fruit is grapes
color is green

Python Class self Constructor

self is also used to refer to a variable field within the class. Let’s take an example and see how it works:

class Person:
 
# name made in constructor
def __init__(self, John):
self.name = John
 
def get_person_name(self):
return self.name

In the above example, self refers to the name variable of the entire Person class. Here, if we have a variable within a method, self will not work. That variable is simply existent only while that method is running and hence, is local to that method. For defining global fields or the variables of the complete class, we need to define them outside the class methods.

Is self a Keyword?

self is used in different places and often thought to be a keyword. But unlike in C++, self is not a keyword in Python.

self is a parameter in function and the user can use a different parameter name in place of it. Although it is advisable to use self because it increases the readability of code.

Example:

class this_is_class:
def show(in_place_of_self):
print("It is not a keyword "
"and you can use a different keyword")
 
object = this_is_class()
object.show()

Output:

It is not a keyword and you can use a different keyword

Also Check out Data Structures You Need To Learn In Python

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