Python Coding challenge - Day 886| What is the output of the following Python Code?

 

Code Explanation:

1. Class Definition

class Data:

You define a class named Data.

A class is a blueprint for creating objects that can hold data and behavior.

2. Constructor (__init__)

    def __init__(self, v):

        self.v = v

__init__ is the constructor that runs when a new Data object is created.

It accepts a parameter v and assigns it to the instance attribute self.v.

After this, every Data instance stores its value in v.

3. __repr__ Magic Method

    def __repr__(self):

        return f"<<{self.v}>>"

__repr__ is a special (magic) method that returns the “official” string representation of the object.

When you inspect the object in the REPL or use print() (if __str__ is not defined), Python will use __repr__.

This implementation returns a formatted string <<value>>, inserting the instance’s v value into the template.

4. Creating an Instance

d = Data(8)

This creates an instance d of class Data with v = 8.

The constructor stores 8 in d.v.

5. Printing the Object

print(d)

print(d) tries to convert d to a string. Because Data defines __repr__ (and no __str__), Python uses __repr__.

The __repr__ method returns the string "<<8>>", which print outputs.

Final Output

<<8>>

500 Days Python Coding Challenges with Explanation