Python Coding challenge - Day 1305| What is the output of the following Python Code?

 

Code Explanation:

1. Creating a Class

class Counter:

- Defines a class named Counter.

- A class acts as a blueprint for creating objects.

- Here, the class is designed to maintain and update a counter value.

2. Defining a Class Variable

    count = 5

- Creates a class variable named count.

- Its initial value is 5.

- This variable belongs to the class rather than an individual object.

- It can be accessed using Counter.count.

3. Using the Class Method Decorator

    @classmethod

- @classmethod is a built-in Python decorator.

- It converts the following method into a class method.

- A class method receives the class itself as its first argument instead of an instance.

4. Defining the Class Method

    def update(cls, n):

- Defines a method named update().

- cls refers to the current class, which is Counter.

- n represents the value that needs to be added.

- Unlike self, which refers to an object, cls refers to the class.

5. Updating the Class Variable

        cls.count += n

- Accesses the class variable using cls.count.

- Adds the value of n to the existing count.

- Updates the class variable directly.

- If count is initially 5 and n is 3, the new value becomes 8.

6. Calling the Class Method

Counter.update(3)

- Calls the update() method directly through the class.

- No object creation is required.

- The value 3 is passed to the parameter n.

- The method updates Counter.count from 5 to 8.

7. Printing the Updated Value

print(Counter.count)

- Accesses the updated class variable.

- The value is now 8.

- The print() function displays the result.

Final Output

Correct Output

8

Books: 100 Python Programs for Beginner with explanation