Array Access and Update at Index in DSA Python - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to access the element at index 2 in the list.

DSA Python

my_list = [10, 20, 30, 40, 50]
print(my_list[[1]])

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

A2

B3

C1

D4

Attempts:

3 left

💡 Hint

Common Mistakes

Using index 3 instead of 2, which accesses the fourth element.

Using index 1, which accesses the second element.

Index 2 accesses the third element in the list, which is 30.

2fill in blank

medium

Complete the code to update the element at index 1 to 99.

DSA Python

numbers = [5, 10, 15, 20]
numbers[[1]] = 99
print(numbers)

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A0

B1

C2

D3

Attempts:

3 left

💡 Hint

Common Mistakes

Updating index 0 instead of 1.

Using an index out of range.

Index 1 refers to the second element, which is updated to 99.

3fill in blank

hard

Fix the error in the code to correctly update the last element to 100.

DSA Python

data = [1, 2, 3, 4, 5]
data[[1]] = 100
print(data)

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A4

B-1

C5

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Using index 5 which is out of range.

Using index -1 when positive index is expected.

The last element is at index 4 (length - 1), so data[4] updates it correctly.

4fill in blank

hard

Fill both blanks to access and update the middle element of the list.

DSA Python

arr = [10, 20, 30, 40, 50]
mid_index = len(arr) [1] 2
arr[mid_index] = [2]
print(arr)

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A//

B/

C25

D30

Attempts:

3 left

💡 Hint

Common Mistakes

Using '/' which results in float index causing error.

Updating the middle element to wrong value.

Using integer division '//' by 2 finds the middle index. Updating that index to 25 changes the middle element.

5fill in blank

hard

Fill all three blanks to create a dictionary with keys as uppercase letters and values as elements greater than 10.

DSA Python

values = {'a': 5, 'b': 15, 'c': 25, 'd': 8}
result = { [1]: [2] for k, v in values.items() if v [3] 10}
print(result)

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Ak.upper()

Bv

C>

Dk

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'k' instead of 'k.upper()' for keys.

Using '<' instead of '>' in the condition.

Using keys as values or vice versa.

Keys are converted to uppercase with k.upper(), values are v, and only values greater than 10 are included.