Tuesday, 2 September 2025

Python Coding challenge - Day 710| What is the output of the following Python Code?


 Code Explanation:

1) from dataclasses import dataclass

Imports the dataclass decorator from Python’s dataclasses module.

dataclass automatically adds:

__init__ method

__repr__ method (nice string representation)

Optional comparison methods (__eq__, etc.)

2) @dataclass
@dataclass
class Point:
    x: int
    y: int = 0

Decorates the Point class to become a dataclass.

Python will automatically generate an __init__ method like:

def __init__(self, x, y=0):
    self.x = x
    self.y = y

And a __repr__ method like:

def __repr__(self):
    return f"Point(x={self.x}, y={self.y})"

3) x: int and y: int = 0

These are type hints (int) for the fields.

y has a default value of 0 → optional during object creation.

x is required when creating a Point object.

4) p = Point(5)

Creates a new Point object.

Passes 5 for x.

y is not provided → uses default y=0.

5) print(p)

Prints the object using the auto-generated __repr__.

Output will be:

Point(x=5, y=0)

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