Queue Concept and FIFO Principle in DSA Python - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to add an element to the end of the queue.

DSA Python

queue = []
queue.[1](5)
print(queue)

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

Aappend

Bpop

Cinsert

Dremove

Attempts:

3 left

💡 Hint

Common Mistakes

Using pop instead of append removes an element instead of adding.

Using insert adds at a specific position, not necessarily the end.

The append method adds an element to the end of the list, which simulates adding to the end of the queue.

2fill in blank

medium

Complete the code to remove the first element from the queue following FIFO.

DSA Python

queue = [1, 2, 3]
first = queue.[1](0)
print(first, queue)

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

Ainsert

Bremove

Cappend

Dpop

Attempts:

3 left

💡 Hint

Common Mistakes

Using remove removes by value, not by position.

Using append or insert does not remove elements.

The pop(0) method removes and returns the first element, following the FIFO principle.

3fill in blank

hard

Fix the error in the code to correctly dequeue an element from the queue.

DSA Python

queue = [10, 20, 30]
removed = queue.[1](0)
print(removed, queue)

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

Aremove(0)

Bpop(0)

Cdelete

Dpop

Attempts:

3 left

💡 Hint

Common Mistakes

Using remove(0) causes an error because remove expects a value, not an index.

Using delete is not a list method.

The pop(0) method removes and returns the first element, following the FIFO principle.

4fill in blank

hard

Fill both blanks to create a queue and add an element following FIFO principle.

DSA Python

queue = [1]
queue.[2](7)
print(queue)

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

A[]

Bappend

Cpop

D{}

Attempts:

3 left

💡 Hint

Common Mistakes

Using {} creates a dictionary, not a queue list.

Using pop to add elements is incorrect.

Queues can be represented as lists []. Adding an element uses append to add at the end.

5fill in blank

hard

Fill all three blanks to dequeue an element and show the queue state.

DSA Python

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

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

A10, 20, 30

Bpop

C0

Dappend

Attempts:

3 left

💡 Hint

Common Mistakes

Using append instead of pop to remove elements.

Using pop without index removes the last element, not the first.

The queue starts with elements 10, 20, 30. To dequeue, use pop(0) which removes the first element (index 0).