Python Coding challenge - Day 1117| What is the output of the following Python Code?

 

Code Explanation:

1️⃣ Importing chain

from itertools import chain

Explanation

Imports chain from Python’s itertools module.

chain is used to combine multiple iterables.

2️⃣ Creating First List

a = [1,2]

Explanation

A list a is created with values:

[1, 2]

3️⃣ Creating Second List

b = [3,4]

Explanation

Another list b is created:

[3, 4]

4️⃣ Using chain()

chain(a, b)

Explanation

chain(a, b) links both lists sequentially.

It does NOT create a new list immediately.

It returns an iterator.

👉 Internally behaves like:

1 → 2 → 3 → 4

5️⃣ Converting to List

list(chain(a, b))

Explanation

Converts the iterator into a list.

Collects all elements in order.

6️⃣ Printing Result

print(list(chain(a, b)))

Explanation

Displays the combined list.

📤 Final Output

[1, 2, 3, 4]

Book:  700 Days Python Coding Challenges with Explanation