Self parameter and Constructor in Python

• Self in Python is reference variable which always point toward current object inside the class.
• Self is used to access instance variables and instance methods of object inside the class.
• Whenever we create constructor and methods inside the class, it accepts self as a first parameter.
• Self is used to create instance variables.

1. class Student :
2.     def __init__(self,name,age):
3.         self.name=name       
4.         self.age=age       # self.name and self.age is instance variable.
5.     def display():
6.         print('Name of student is '+self.name)   #calling instance variable by self parameter
7.         print('Name of student is '+str(self.age)) 
8. s1 = Student('ritesh',25)
9. s1.display()

Constructor:

• constructor is special method in Python which is automatically called when we create object of the class.
• constructor is represented by __init__ method in Python.
• It is used to declare and initialize instance variables.
• In case we don't provide constructor then Python provide default constructor.
• It is executed once at the time of object creation.