Python Coding challenge - Day 1118| What is the output of the following Python Code?

 

Code Explanation:

1️⃣ Importing dataclass

from dataclasses import dataclass

Explanation

Imports the dataclass decorator.

It helps automatically generate methods like:

__init__

__repr__

__eq__

2️⃣ Applying @dataclass Decorator

@dataclass

Explanation

This decorator modifies class A.

Automatically adds useful methods.

Saves you from writing boilerplate code.

3️⃣ Defining the Class

class A:

Explanation

A class A is created.

It will hold data (like a structure).

4️⃣ Defining Attributes with Type Hints

x: int

y: int

Explanation

Defines two attributes:

x of type int

y of type int

These are used by @dataclass to generate constructor.

5️⃣ Auto-Generated Constructor

👉 Internally, Python creates:

def __init__(self, x, y):

    self.x = x

    self.y = y

Explanation

You don’t write this manually.

@dataclass creates it automatically.

6️⃣ Creating Object

a = A(1,2)

Explanation

Calls auto-generated __init__.

Assigns:

a.x = 1

a.y = 2

7️⃣ Printing Object

print(a)

Explanation

Calls auto-generated __repr__() method.

👉 Internally behaves like:

"A(x=1, y=2)"

📤 Final Output

A(x=1, y=2)

Book: 900 Days Python Coding Challenges with Explanation