Dequeue Operation in DSA Python - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to add an element to the front of the dequeue.

DSA Python

from collections import deque

queue = deque()
queue.[1](10)
print(list(queue))

Drag options to blanks, or click blank then click option'

Aappendleft

Bappend

Cpop

Dpopleft

Attempts:

3 left

💡 Hint

Common Mistakes

Using append instead of appendleft adds element to the end, not front.

Using pop or popleft removes elements instead of adding.

The method appendleft adds an element to the front of the dequeue.

2fill in blank

medium

Complete the code to remove an element from the rear of the dequeue.

DSA Python

from collections import deque

queue = deque([1, 2, 3])
removed = queue.[1]()
print(removed)
print(list(queue))

Drag options to blanks, or click blank then click option'

Apopleft

Bpop

Cappend

Dappendleft

Attempts:

3 left

💡 Hint

Common Mistakes

Using popleft removes from the front, not the rear.

Using append or appendleft adds elements instead of removing.

The pop method removes and returns the element from the rear of the dequeue.

3fill in blank

hard

Fix the error in the code to remove an element from the front of the dequeue.

DSA Python

from collections import deque

queue = deque([5, 6, 7])
removed = queue.[1]()
print(removed)
print(list(queue))

Drag options to blanks, or click blank then click option'

Apopleft

Bappend

Cappendleft

Dpop

Attempts:

3 left

💡 Hint

Common Mistakes

Using pop removes from the rear, not front.

Using append or appendleft adds elements instead of removing.

popleft removes and returns the element from the front of the dequeue.

4fill in blank

hard

Fill both blanks to add 20 to the rear and remove from the front of the dequeue.

DSA Python

from collections import deque

queue = deque([10, 15])
queue.[1](20)
removed = queue.[2]()
print(removed)
print(list(queue))

Drag options to blanks, or click blank then click option'

Aappend

Bpop

Cpopleft

Dappendleft

Attempts:

3 left

💡 Hint

Common Mistakes

Using pop instead of popleft removes from rear, not front.

Using appendleft adds to front, not rear.

append adds to the rear, popleft removes from the front.

5fill in blank

hard

Fill all three blanks to add 5 to front, remove from rear, and then add 10 to rear.

DSA Python

from collections import deque

queue = deque([1, 2, 3])
queue.[1](5)
removed = queue.[2]()
queue.[3](10)
print(removed)
print(list(queue))

Drag options to blanks, or click blank then click option'

Aappendleft

Bpop

Cappend

Dpopleft

Attempts:

3 left

💡 Hint

Common Mistakes

Using popleft instead of pop removes from front, not rear.

Using append instead of appendleft adds to rear, not front.

appendleft adds to front, pop removes from rear, append adds to rear.