What is the use of the word "self" in Python?

Question

excuse my ignorance on the subject because I’m starting now in the Python language, and for this very reason I wanted to know what works the reserved word "self".

Thanks for your attention and patience!

Answer 1

The reserved word self serves for you to refer to yourself

object(instance) both when you are going to use methods and when you are

use attributes belonging to and this object.

Dry up the example:

class Ponto(object):               #(1)   
    def __init__(self, x):         #(2)
        self.x = x                 #(3)
    def set_x(self, valor):        #(4)
        self.x = valor             #(5)

objeto_1 = Ponto(2)     # inicilizamos um objeto com x = 2
objeto_2 = Ponto(3)     # inicializamos outro objeto com x = 4
print(objeto_1.x)       # imprime o valor de x do objeto_1 que é 2
objeto_1.set_x(7)       # alteramos o valor x de objeto_1 para 7
print(objeto_1.x)       # imprime o valor de x do objeto_1 que é 7
objeto_2.set_x(5)       # alteramos o valor de x do objeto_2 para 5
print(objeto_2.x)       # imprime o valor de x do objeto_2 que é 5

In line (1) we create the Point Class

On line (2) we initialize the Point Class and ask that two be passed

parameters (self, x) do not worry about the self, as python methods when

called pass the object(instance) as the first parameter, i.e., self is

a reference to the object in question itself. I know that it is difficult to assimilate

but think I’ll try to make it clear think with me:

A class is nothing more than a factory of objects ? I mean I can create

infinite objects, but as seen above I initialized two objects for the class

Point (object_1, object_2), when I decided to change the x of object_1 as the

interpreter knew what the object in question was ???

This is done thanks to the self that is always passed as the first parameter.

I’m sorry for stretching but I’ll do everything I can to help.

Answer 2

The reserved word self is used as a reference to the same object. recommend reading Significadodoself and Introducaooop