Python Coding challenge - Day 894| What is the output of the following Python Code?

 

Code Explanation:

Class Definition

class Product:

This defines a new class named Product.

The class will represent a product that has a price and some logic around it.

Constructor (__init__) Method

    def __init__(self, p):

        self._price = p

__init__ is the constructor — it runs automatically when you create a new Product object.

It takes one argument besides self: p, which represents the base price.

self._price = p:

Stores the value of p in an attribute called _price.

The single underscore _price is a convention meaning “internal use” (protected-style attribute).

Property Decorator

    @property

    def price(self):

        return self._price * 2

@property turns the price method into a read-only attribute.

That means you can access price like p.price instead of p.price().

Inside the method:

return self._price * 2

It doesn’t return the raw _price.

Instead, it returns double the stored price.

This is a form of encapsulation + computed property:

the internal value is _price, but the external visible value is _price * 2.

Creating an Object

p = Product(40)

Creates an instance p of the Product class.

Calls __init__(self, p) with p = 40.

Inside __init__, _price becomes 40.

So now: p._price == 40.

Accessing the Property

print(p.price)

Accessing p.price triggers the @property method price().

It calculates: self._price * 2 → 40 * 2 = 80.

print outputs:

80

Final Output

80

500 Days Python Coding Challenges with Explanation