Python Coding challenge - Day 1194| What is the output of the following Python Code?

 

Code Explanation:

🔹 1. Creating the Class

class Student:

✅ Explanation:

A class named Student is created.

It acts as a blueprint for creating student objects.

Current structure:

Student Class

│

├── __init__()

└── marks()

At this point, no object exists.

🔹 2. Defining the Constructor

def __init__(self):

✅ Explanation:

__init__() is the constructor of the class.

It is automatically called whenever a new object is created.

Its job is to initialize the object's data.

Visual:

Object Created

↓

__init__()

↓

Initialize Variables

🔹 3. Creating an Instance Variable

self._marks = 80

✅ Explanation:

A variable named _marks is created for the current object.

Current object:

Student Object

_marks = 80

Why _marks?

The single underscore (_) is a Python naming convention that indicates:

"This is an internal (protected) variable.

It should not be accessed directly."

Although you can access it, it's recommended to use a property instead.

🔹 4. Using the @property Decorator

@property

✅ Explanation:

@property converts the next method into a property.

Normally, you would call a method like this:

obj.marks()

With @property, you can access it like an attribute:

obj.marks

without parentheses.

Visual:

Without @property

marks()

↓

With @property

marks

🔹 5. Defining the Property Method

def marks(self):

✅ Explanation:

This method is responsible for returning the student's marks.

Because of @property, Python treats it like an attribute.

Current structure:

Student

│

_marks = 80

│

marks

↓

Returns _marks

🔹 6. Returning the Value

return self._marks

✅ Explanation:

The method returns the value stored in:

self._marks

Current value:

80

So whenever someone accesses:

s.marks

Python actually executes:

marks()

behind the scenes and returns:

80

🔹 7. Creating an Object

s = Student()

✅ Explanation:

A new object of the Student class is created.

Execution flow:

Student()

↓

__init__()

↓

_marks = 80

Current object:

s

↓

_marks = 80

🔹 8. Accessing the Property

print(s.marks)

✅ Explanation:

Here, it looks like we're accessing an attribute.

s.marks

But because marks is decorated with @property, Python internally calls:

s.marks()

and gets:

80

🔹 9. Printing the Result

print(s.marks)

✅ Explanation:

Python prints the value returned by the property.

Output:

80

🎯 Final Output

80

Book: 100 Python Programs for Beginner with explanation