Python Coding challenge - Day 834| What is the output of the following Python Code?

 

Code Explanation:

Importing dataclass

from dataclasses import dataclass

Theory:

The dataclasses module provides a decorator and functions to automatically generate special methods in classes.

@dataclass automatically creates methods like:

__init__() → constructor

__repr__() → for printing objects

__eq__() → comparison

This reduces boilerplate code when creating simple classes that mainly store data.

Defining the Data Class

@dataclass

class Item:

Theory:

@dataclass tells Python to treat Item as a data class.

A data class is primarily used to store attributes and automatically provides useful methods.

Declaring Attributes

    price: int

    qty: int

Theory:

These are type-annotated fields:

price is expected to be an int.

qty is expected to be an int.

The dataclass automatically generates an __init__ method so you can create instances with Item(price, qty).

Creating an Object

obj = Item(12, 4)

Theory:

This creates an instance obj of the Item class.

The dataclass automatically calls __init__ with price=12 and qty=4.

Internally:

obj.price = 12

obj.qty = 4

Performing Calculation and Printing

print(obj.price * obj.qty)

Theory:

Accesses the object’s attributes:

obj.price = 12

obj.qty = 4

Multiplies: 12 * 4 = 48

print() displays the result.

Final Output

48

600 Days Python Coding Challenges with Explanation