__init__ Method :
                  The __init__ method in Python is a special method that is automatically executed when an object of a class is created.

                   It is commonly called a constructor because it is used to initialize the object’s data.


What is a Constructor ?

A constructor is a special method that

  • runs automatically when an object is created
  • initializes object attributes
  • sets the initial state of the object

In Python , the constructor method is named as __init__ .

Syntax :

Python 
class ClassName: def __init__(self): statements


  • __init__ is a predefined method name
  • self refers to the current object
  • Python calls it automatically during object creation

Initializing Instance Variables :

Python 
class Student: def __init__(self, name, age): self.name = name self.age = age def display(self): print(self.name, self.age) s1 = Student("Rahul", 22) s1.display() #output Rahul 22


Parameterized Constructor :

Python 
class Employee: def __init__(self, emp_id, salary): self.emp_id = emp_id self.salary = salary


Default Constructor :

Python 
class Demo: def __init__(self): self.msg = "Hello" d = Demo() print(d.msg)