Python Coding challenge - Day 1066| What is the output of the following Python Code?

 

Code Explanation:

🔹 1️⃣ Defining Class A

class A:

Creates a class named A.

Objects created from this class will inherit its methods and attributes.

🔹 2️⃣ Defining the __getattr__ Method

def __getattr__(self, name):

    return name.upper()

This method is automatically called when Python cannot find an attribute normally.

Parameters:

self → the object

name → the attribute name being accessed

Behavior here:

It converts the attribute name to uppercase and returns it.

Example:

a.test → "TEST"

🔹 3️⃣ Creating an Object

a = A()

Creates an instance named a.

At this moment:

a.__dict__ = {}

The object has no attributes defined.

🔹 4️⃣ Accessing Missing Attributes

print(a.test + a.python)

Python evaluates each attribute separately.

🔹 Step 1: Accessing a.test

Python lookup order:

1️⃣ Check instance dictionary

a.__dict__

No test found.

2️⃣ Check class attributes

A.__dict__

No test.

3️⃣ Check parent classes

Still not found.

4️⃣ Python calls:

__getattr__(a, "test")

Inside the method:

return "TEST"

So:

a.test → "TEST"

🔹 Step 2: Accessing a.python

Again Python cannot find the attribute.

So it calls:

__getattr__(a, "python")

Inside the method:

return "PYTHON"

So:

a.python → "PYTHON"

🔹 Step 3: String Concatenation

"TEST" + "PYTHON"

Result:

"TESTPYTHON"

✅ Final Output

TESTPYTHON

700 Days Python Coding Challenges with Explanation