Python Coding challenge - Day 870| What is the output of the following Python Code?

 

Code Explanation:

1. Class Definition

class Data:

This creates a new class named Data.

Objects created from this class will hold a data value and know how to represent themselves as text.

2. Constructor Method

    def __init__(self, d):

        self.d = d

__init__ runs every time a new object is created.

It receives a value d and stores it in the object as self.d.

So each Data object will have a d attribute.

3. Magic Method __repr__

    def __repr__(self):

        return f"Data={self.d}"

__repr__ is a magic method that defines how an object should be represented as a string, mainly for debugging.

When you print an object, Python prefers __str__, but if it is not defined, Python uses __repr__.

It returns a string like "Data=9" when the object's d is 9.

4. Creating an Object

obj = Data(9)

Creates an instance named obj with d = 9.

The constructor stores 9 inside self.d.

5. Printing the Object

print(obj)

Since no __str__ method exists, Python uses __repr__.

__repr__ returns:

Data=9

This becomes the final print output.

Final Output

Data=9

700 Days Python Coding Challenges with Explanation