Python Coding challenge - Day 853| What is the output of the following Python Code?

Code Explanation:

1. Class Definition

class Circle:

This defines a new class named Circle.

A class is a blueprint for creating objects.

Circle objects will represent circles with a radius.

2. Constructor Method

    def __init__(self, r):

        self._radius = r

__init__ is the constructor method in Python. It runs automatically when a new object is created.

r is a parameter passed during object creation.

self._radius = r stores the radius value in a protected attribute _radius.

By convention, attributes with a single underscore _ are protected, meaning they should not be accessed directly from outside, but are still technically accessible.

3. Property Decorator

    @property

    def radius(self):

        return self._radius

@property makes the radius() method behave like a read-only attribute.

When you access c.radius, Python calls this method automatically.

return self._radius returns the value of the protected attribute _radius.

Benefit: You can later add validation or calculations without changing how you access the attribute.

4. Creating an Object

c = Circle(5)

This creates an object c of the class Circle.

The constructor __init__ is called with r=5.

The object now has _radius = 5.

5. Accessing the Property

print(c.radius)

Accessing c.radius calls the radius property method.

The method returns the value of _radius, which is 5.

Python prints 5.

Final Output

5

600 Days Python Coding Challenges with Explanation