Python Coding challenge - Day 507| What is the output of the following Python Code?

Code Explanation:

1. from collections import deque

Explanation:

Imports the deque class from the collections module. A deque (double-ended queue) allows fast appends and pops from both ends.

Output:

No output.

2. d = deque()

Explanation:

Creates an empty deque named d.

Current state of d:

deque([])

Output:

No output.

3. d.appendleft(1)

Explanation:

Adds 1 to the left end of the deque.

Current state of d:

deque([1])

Output:

No output.

4. d.appendleft(2)

Explanation:

Adds 2 to the left end. Since 1 is already there, 2 goes before it.

Current state of d:

deque([2, 1])

Output:

No output.

5. d.append(3)

Explanation:

Adds 3 to the right end (normal append).

Current state of d:

deque([2, 1, 3])

Output:

No output.

6. d.rotate(1)

Explanation:

Rotates the deque right by 1 position.

This means the last element moves to the front.

Before rotation:

deque([2, 1, 3])

After rotation:

deque([3, 2, 1])

7. print(list(d))

Explanation:

Converts the deque to a list and prints it.

Output:

[3, 2, 1]