Hash Map vs Array vs Linked List for Lookup in DSA Python - Interactive Comparison Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to get the value for key 'apple' from the dictionary.

DSA Python

fruits = {'apple': 5, 'banana': 3, 'orange': 2}
value = fruits[1]'apple'
print(value)

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

A[

B.get(

C('

D{

Attempts:

3 left

💡 Hint

Common Mistakes

Using parentheses instead of square brackets for dictionary access.

Using dot notation which doesn't work for dictionary keys.

Use square brackets [] to access a value by key in a dictionary.

2fill in blank

medium

Complete the code to find the index of value 7 in the list.

DSA Python

numbers = [3, 7, 1, 9]
index = numbers.[1](7)
print(index)

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

Aindex

Bfind

Csearch

Dlocate

Attempts:

3 left

💡 Hint

Common Mistakes

Using methods like find which do not exist for lists.

Trying to use search or locate which are not list methods.

The index() method returns the first index of the given value in a list.

3fill in blank

hard

Fix the error in the linked list traversal to print all node values.

DSA Python

class Node:
    def __init__(self, val):
        self.val = val
        self.next = None

head = Node(1)
head.next = Node(2)
head.next.next = Node(3)

current = head
while current is not None:
    print(current[1]val)
    current = current.next

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

A:

B->

C.

D[

Attempts:

3 left

💡 Hint

Common Mistakes

Using arrow -> which is not valid in Python.

Using brackets or colon which are invalid for attribute access.

Use dot . to access attributes of an object in Python.

4fill in blank

hard

Fill both blanks to create a dictionary comprehension that maps words to their lengths for words longer than 3 letters.

DSA Python

words = ['cat', 'house', 'dog', 'elephant']
lengths = {word: [1] for word in words if len(word) [2] 3}
print(lengths)

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

Alen(word)

B<

C>

D==

Attempts:

3 left

💡 Hint

Common Mistakes

Using < instead of > for filtering.

Not using len(word) for the value.

Use len(word) to get the length and > to filter words longer than 3.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that maps uppercase words to their counts for counts greater than 0.

DSA Python

data = {'apple': 2, 'banana': 0, 'cherry': 5}
result = {{ [1]: [2] for k, v in data.items() if v [3] 0 }}
print(result)

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

Ak.upper()

Bv

C>

Dk.lower()

Attempts:

3 left

💡 Hint

Common Mistakes

Using k.lower() instead of k.upper().

Filtering with == or < instead of >.

Use k.upper() for uppercase keys, v for values, and filter with > 0.