Nested lists in Python - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to access the first element of the first nested list.

Python

nested = [[1, 2], [3, 4]]
print(nested[1][0])

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A[1]

B[0]

C[[0]]

D(0)

Attempts:

3 left

💡 Hint

Common Mistakes

Using parentheses instead of square brackets.

Using the wrong index like [1] instead of [0].

To get the first nested list, use [0]. Then [0] accesses its first element.

2fill in blank

medium

Complete the code to print the length of the second nested list.

Python

nested = [[5, 6, 7], [8, 9]]
print(len(nested[1]))

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A[1]

B[0]

C[2]

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Using index 0 instead of 1.

Trying to get length of the whole nested list instead of the inner list.

The second nested list is at index 1. Use len(nested[1]) to get its length.

3fill in blank

hard

Fix the error in the code to correctly access the number 10 inside the nested list.

Python

numbers = [[4, 5], [6, 7, 8], [9, 10]]
print(numbers[1][1])

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A[2]

B[3]

C[1]

D(2)

Attempts:

3 left

💡 Hint

Common Mistakes

Using index 3 which is out of range.

Using parentheses instead of square brackets.

The number 10 is in the third nested list, which is at index 2. Then index [1] accesses 10.

4fill in blank

hard

Fill both blanks to create a nested list with two inner lists, each containing numbers 1 to 3 and 4 to 6.

Python

nested = [[1], [2]]
print(nested)

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A[1, 2, 3]

B[4, 5, 6]

C[7, 8, 9]

D[0, 1, 2]

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong number ranges.

Putting numbers directly without lists.

The first inner list should be [1, 2, 3] and the second [4, 5, 6] to match the instruction.

5fill in blank

hard

Fill all three blanks to create a nested list comprehension that squares numbers 1 to 3 and 4 to 6 separately.

Python

nested_squares = [[x[1]2 for x in range([2], 4)], [x[1]2 for x in range(4, [3])] ]
print(nested_squares)

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A**

B1

C4

D7

Attempts:

3 left

💡 Hint

Common Mistakes

Using multiplication * instead of power **.

Wrong range start or end values.

The operator for power is **. The first range starts at 1, the second ends before 7 to include 6.