Python Coding challenge - Day 934| What is the output of the following Python Code?

 

Code Explanation:

1. Defining the Class

class X:

A class named X is defined.

It will customize how its objects behave in boolean contexts (like if, while, bool()).

2. Defining the __len__ Method

    def __len__(self):

        return 3

__len__ defines what len(obj) should return.

It returns 3, so:

len(X()) → 3

Normally, objects with length > 0 are considered True in boolean context.

3. Defining the __bool__ Method

    def __bool__(self):

        return False

__bool__ defines the truth value of the object.

It explicitly returns False.

4. Boolean Evaluation Rule

Python uses this rule:

If __bool__ is defined → use it.

Else if __len__ is defined → len(obj) > 0 means True.

Else → object is True.

So __bool__ has higher priority than __len__.

5. Creating the Object and Evaluating It

print(bool(X()))

What happens:

X() creates an object.

bool(X()) calls X.__bool__().

__bool__() returns False.

print prints False.

6. Final Output

False

Final Answer

✔ Output:

False

200 Days Python Coding Challenges with Explanation