Python Coding challenge - Day 1204| What is the output of the following Python Code?

 

Code Exaplanation:

🔹 1. Importing attrgetter

from operator import attrgetter

✅ Explanation

attrgetter() is imported from Python's operator module.

It creates a function that retrieves an attribute from an object.

Instead of writing the attribute name every time, you create a reusable attribute getter.

Think of it like an ID card scanner.

Student Object

↓

Scan "marks"

↓

Return Marks

It doesn't change the object—it only fetches an attribute.

🔹 2. Creating the Class

class Student:

✅ Explanation

A class named Student is created.

Current structure:

Student

│

└── __init__()

At this point, no object exists.

🔹 3. Defining the Constructor

def __init__(self, name, marks):

✅ Explanation

The constructor initializes every new Student object.

It accepts:

name

marks

Whenever an object is created, this method runs automatically.

Visual:

Student()

↓

__init__()

↓

Initialize Data

🔹 4. Storing the Name

self.name = name

✅ Explanation

The value passed to name is stored inside the object.

If:

name = "Amit"

Then:

Student Object

↓

name = "Amit"

🔹 5. Storing the Marks

self.marks = marks

✅ Explanation

Similarly, the value passed to marks is stored.

If:

marks = 95

Memory becomes:

Student Object

↓

name = "Amit"

marks = 95

🔹 6. Creating the Object

s = Student("Amit", 95)

✅ Explanation

A new Student object is created.

Python automatically calls:

__init__("Amit", 95)

Memory after object creation:

s

│

▼

Student

│

├── name = "Amit"

└── marks = 95

🔹 7. Creating an Attribute Getter

attrgetter("marks")

✅ Explanation

This line does not fetch the marks immediately.

Instead, it creates a callable object that remembers:

Whenever you give me an object,

I'll return its

marks

attribute.

Think of it as preparing a command.

Getter

↓

"marks"

↓

Waiting for an object...

🔹 8. Passing the Object

attrgetter("marks")(s)

✅ Explanation

Now the object s is passed to the attribute getter.

Internally, Python performs:

s.marks

Current object:

s

↓

marks = 95

Returned value:

95

🔹 9. Printing the Result

print(attrgetter("marks")(s))

✅ Explanation

Python prints the returned value.

Output:

95

🎯 Final Output

95

Book: Data Analysis Using ML Models (RandomForestClassifier, DecisionTreeClassifier, LogisticRegression)