Python Coding challenge - Day 782| What is the output of the following Python Code?

 

Code Explanation:

1. from collections import deque

Imports the deque class from Python’s collections module.

deque stands for double-ended queue — it allows fast appending and popping from both ends (left and right).

2. dq = deque([10, 20, 30])

Creates a deque (like a list) with three elements:

dq = deque([10, 20, 30])

Current state:

[10, 20, 30]

3. dq.append(40)

Adds (appends) 40 to the right end of the deque.

New state:

[10, 20, 30, 40]

4. dq.appendleft(5)

Adds 5 to the left end of the deque.

New state:

[5, 10, 20, 30, 40]

5. dq.pop()

Removes and returns the rightmost element (40).

New state:

[5, 10, 20, 30]

6. dq.popleft()

Removes and returns the leftmost element (5).

New state:

[10, 20, 30]

7. print(list(dq))

Converts the deque to a list for printing.

Final output:

[10, 20, 30]

Final Output:

[10, 20, 30]

500 Days Python Coding Challenges with Explanation