Python Coding challenge - Day 1298| What is the output of the following Python Code?

 

Code Explanation:

1. Defining the Class

class Score:

- The class keyword defines a class named Score.

- A class acts as a blueprint for creating objects.

- This class demonstrates how to control attribute access using properties.

2. Initializing the Instance Variable

def __init__(self): self._n = 5

- __init__() runs automatically when a new Score object is created.

- self refers to the current object.

- self._n = 5 initializes the instance variable _n with the value 5.

- The underscore indicates that _n is intended for internal use by convention.

3. Applying the @property Decorator

@property

- The @property decorator allows a method to be accessed like an attribute.

- Instead of calling s.n(), you can simply write s.n.

- It is useful for calculating or controlling values when an attribute is accessed.

4. Defining the Getter Method

def n(self): return self._n * 2

- Defines the getter method for the property n.

- It reads the stored value of _n and multiplies it by 2.

- Initially, _n = 5, so accessing s.n returns 10.

5. Applying the @n.setter Decorator

@n.setter

- This decorator defines how assignments to the property n are handled.

- It allows you to write s.n = 8 and control what happens when that assignment occurs.

- The setter updates the underlying _n value.

6. Defining the Setter Method

def n(self, v): self._n = v

- The setter receives the assigned value through the parameter v.

- When s.n = 8 executes, v becomes 8.

- The statement updates self._n to 8.

- The getter will then use this updated value.

7. Creating an Object

s = Score()

- Creates an instance of the Score class.

- The initializer executes automatically.

- The initial value becomes s._n = 5.

8. Updating the Property

s.n = 8

- Assigns 8 to the property n.

- Python calls the setter method.

- The setter stores 8 in s._n.

- The stored value changes from 5 to 8.

9. Accessing and Printing the Property

print(s.n)

- Accesses the getter method through the property n.

- The getter calculates s._n * 2.

- Since s._n = 8, the result is 8 * 2 = 16.

- The print() function displays 16.

Final Output

16

Book: 100 Python Programs for Beginner with explanation