Python Coding challenge - Day 1159| What is the output of the following Python Code?

 

Code Explanation:

🔹 1. Class Definition

class Test:

✅ Explanation:

A class named Test is created.

Inside this class, the magic method __len__ is defined.

🔹 2. Defining __len__

def __len__(self):

✅ Explanation:

__len__ controls what happens when:

len(obj)

is called.

🔹 3. Returning Length

return 0

✅ Explanation:

Whenever Python asks for object length,

it returns:

0

So:

len(obj)

would become:

0

🔹 4. Creating Object

obj = Test()

✅ Explanation:

Creates object obj of class Test.

🔹 5. Boolean Conversion

print(bool(obj))

✅ Explanation:

Python checks truth value of object.

🔹 6. How Python Decides Truth Value

Python checks in this order:

__bool__()

If absent → __len__()

In this class:

__bool__ does NOT exist

So Python uses:

__len__()

🔹 7. Internal Execution

Python internally does:

len(obj)

which returns:

0

🔹 8. Boolean Rule

✅ Important Rule:

Length Boolean Value

0 False

>0 True

Since:

len(obj) = 0

👉 Boolean becomes:

False

🎯 Final Output

False

500 Days Python Coding Challenges with Explanation