Python Coding Challenge - Question with Answer (ID -230526)

 

Explanation:

🔹 Step 1: Create List

x = [3,2,1]

A list is created:

[3,2,1]

🔹 Step 2: Create Special Iterator

it = iter(x.pop, 2)

⚠️ This is a VERY special form of iter() 😈

Syntax:

iter(callable, sentinel)

🔹 Step 3: Understand x.pop

x.pop

This is NOT calling function yet ❌

It is just giving function reference.

So iterator will repeatedly do:

x.pop()

again and again.

🔹 Step 4: Understand Sentinel Value

2

This is sentinel value.

Iterator stops WHEN:

x.pop() == 2

🔹 Step 5: Execute next(it)

next(it)

Iterator internally calls:

x.pop()

⚠️ pop() removes LAST element.

Current list:

[3,2,1]

So:

x.pop() → 1

List becomes:

[3,2]

🔹 Step 6: Compare with Sentinel

Returned value:

1

Sentinel:

2

Since:

1 != 2

iterator continues normally.

So:

next(it) → 1

🔹 Step 7: Print Result

print(1)

👉 Final Output:

1

🔥 Final Output

1