Python Coding challenge - Day 1138| What is the output of the following Python Code?

 

Code Explanation:

🔹 1. Class Definition

class Test:

You are defining a class named Test.

🔹 2. Overriding __getattribute__

def __getattribute__(self, name):

This method is called for every attribute access on an object.

It runs before anything else, even before __getattr__.

➤ Inside __getattribute__

if name == "x":

    return 100

If someone tries to access obj.x, this condition becomes true.

It directly returns 100.

No further lookup happens.

return super().__getattribute__(name)

For any other attribute:

It calls the default attribute lookup mechanism using super().

If the attribute exists → returns it.

If it does NOT exist → raises AttributeError.

🔹 3. Overriding __getattr__

def __getattr__(self, name):

This method is called only when the attribute is NOT found normally.

It acts as a fallback handler.

➤ Inside __getattr__

return 200

If an attribute doesn’t exist (like y), this method returns 200.

🔹 4. Object Creation

obj = Test()

Creates an instance of the Test class.

🔹 5. Printing Values

print(obj.x, obj.y)

Let’s break this step carefully:

➤ Accessing obj.x

__getattribute__ is called with name = "x".

Condition name == "x" is True.

Returns 100.

✔️ So, obj.x = 100

➤ Accessing obj.y

__getattribute__ is called with name = "y".

Condition fails → goes to:

super().__getattribute__("y")

Python tries to find y → it does NOT exist → raises AttributeError.

Since error occurred → Python calls __getattr__.

__getattr__ returns 200.

✔️ So, obj.y = 200

🔹 6. Final Output

100 200

Book:  700 Days Python Coding Challenges with Explanation