Python OOPs


Examples


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Constructor in Python


  • A constructor is a function(method) which is used to initialize the members of the class.
  • The constructor method is executed when an object is created.
  • __init__() is the constructor method in Python.
Syntax
class A:
    def __init__(self):
        #body of the constructor

Types of constructors:

1. Non-Parameterized Constructor:

Non-Parameterized Constructor does not take any argument.

Example
class Data:
    def __init__(self):
        self.a=25
        self.b=40
        
    def add(self):
        self.c=self.a+self.b
        print("Total : ",self.c)
        
obj=Data()
obj.add()

Output

Total :  65   
2. Parameterized Constructor:

Parameterized constructor takes at least one argument.

Example
class Data:
    def __init__(self,x,y):
        self.a=x
        self.b=y
        
    def add(self):
        self.c=self.a+self.b
        print("Total : ",self.c)
        
obj=Data(50,60)
obj.add()

obj=Data(75,25)
obj.add()

Output

Total :  110
Total :  100  

Classes and Objects