when does it required to put self in function in python code example

Example 1: classes in python with self parameter

self represents the instance of the class. By using the “self” keyword we can access the attributes and methods of the class in python. It binds the attributes with the given arguments.

Example 2: why to use self in python

By using the “self” keyword we can access the attributes 
and methods of the class in python.
It binds the attributes with the given arguments.
self is parameter in function and user can use another parameter 
name in place of it.
But it is advisable to use self because,
it increase the readability of code.