Python add() magic method

Last Updated : 04 Sep, 2022

Python __add__() function is one of the magic methods in Python that returns a new object(third) i.e. the addition of the other two objects. It implements the addition operator “+” in Python.

Python add() Syntax

Syntax: obj1.__add__(self, obj2)

obj1: First object to add in the second object.

obj2: Second object to add in the first object.

Returns: Returns a new object representing the summation of the other two objects.

Python add() magic method Example

Python __add__() method adds two objects and returns a new object as a resultant object in Python. The below example returns a new object,

Python3

class GFG: 
  
    def __init__(self, val): 
        self.val = val 
          
    def __add__(self, val2): 
        return GFG(self.val + val2.val) 
  
obj1 = GFG("Geeks") 
obj2 = GFG("ForGeeks") 
obj3 = obj1 + obj2 
print(obj3.val)

Output:

GeeksForGeeks

Note: If we had not defined the __add__() method, Python would have raised a TypeError.

Python3

class GFG: 
  
    def __init__(self, val): 
        self.val = val 
  
obj1 = GFG("Geeks") 
obj2 = GFG("ForGeeks") 
obj3 = obj1 + obj2 
print(obj3.val)

Output:

Traceback (most recent call last):
  File "/home/d8b3b04f2954b8c46b64bc7dd37f6aa4.py", line 11, in <module>
    obj3 = obj1 + obj2
TypeError: unsupported operand type(s) for +: 'GFG' and 'GFG'

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