Python Tutorials · Python self Parameter

Python self Parameter

Learn all about Python self Parameter in this comprehensive tutorial.

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Python __init__ Method

Python Class Properties

•The self parameter is a reference to the current instance of the class.
•Without self, Python would not know which object's properties you want to access:
•It does not have to be named self, you can call it whatever you like, but it has to be the first parameter of any method in the class:
•You can access any property of the class using self:
•You can also call other methods within the class using self:

The self Parameter

The self parameter is a reference to the current instance of the class.

It is used to access properties and methods that belong to the class.

python

class Person:  def __init__(self, name, age):    self.name = name    self.age = age  def greet(self):    print("Hello, my name is " + self.name)p1 = Person("Emil", 25)p1.greet()

Note: Note: The self parameter must be the first parameter of any method in the class.

Why Use self?

Without self, Python would not know which object's properties you want to access:

python

class Person:  def __init__(self, name):    self.name = name  def printname(self):    print(self.name)p1 = Person("Tobias")p2 = Person("Linus")p1.printname()p2.printname()

self Does Not Have to Be Named "self"

It does not have to be named self, you can call it whatever you like, but it has to be the first parameter of any method in the class:

python

class Person:  def __init__(myobject, name, age):    myobject.name = name    myobject.age = age  def greet(abc):    print("Hello, my name is " + abc.name)p1 = Person("Emil", 36)p1.greet()

Note: Note: While you can use a different name, it is strongly recommended to use self as it is the convention in Python and makes your code more readable to others.

Accessing Properties with self

You can access any property of the class using self:

python

class Car:  def __init__(self, brand, model, year):    self.brand = brand    self.model = model    self.year = year  def display_info(self):    print(f"{self.year} {self.brand} {self.model}")car1 = Car("Toyota", "Corolla", 2020)car1.display_info()

Calling Methods with self

You can also call other methods within the class using self:

python

class Person:  def __init__(self, name):    self.name = name  def greet(self):    return "Hello, " + self.name  def welcome(self):    message = self.greet()    print(message + "! Welcome to our website.")p1 = Person("Tobias")p1.welcome()

Module quiz

2 questions

Which of the following is true about Python self Parameter?

It is strictly typedIt is evaluated at runtimeIt requires explicit memory managementIt is deprecated

What is the most common pitfall when working with Python self Parameter?

SyntaxErrorIndentationErrorNameErrorTypeError

Answer all questions to submit.

Python __init__ Method

Python Class Properties

Python self Parameter

AI Summary

The self Parameter

Why Use self?

self Does Not Have to Be Named "self"

Accessing Properties with self

Calling Methods with self

Module quiz