Python Coding challenge - Day 879| What is the output of the following Python Code?

Code Explanation:

1. Class Definition

class Num:

This line defines a new class named Num, which will hold a number and custom behavior for the + operator.

2. Constructor Method (__init__)

def __init__(self, n):

Defines the constructor that runs whenever a Num object is created.

self.n = n

Stores the passed value n inside the object as an attribute named n.

3. Operator Overloading (__add__)

def __add__(self, o):

Defines how the + operator works for two Num objects.

Here, self is the left operand and o is the right operand.

return Num(self.n - o.n)

Although the operator is +, this function performs subtraction.

It returns a new Num object with value self.n - o.n.

4. Creating Objects

a = Num(9)

Creates a Num object with value 9 and stores it in variable a.

b = Num(4)

Creates another Num object with value 4 and stores it in b.

5. Using the + Operator

print((a + b).n)

Python calls a.__add__(b)

Computes 9 - 4 (because __add__ subtracts)

Creates a new Num object with value 5

(a + b).n accesses the .n value of that object

print prints 5

Output:

5 

700 Days Python Coding Challenges with Explanation