why we need to pass self in funtion in python code example

Example 1: self in python

class Class(parentClass):
    def __init__(self,arg):
        self.arg = arg
        
    def function(self):
        print(arg)

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.