Arrays and lists in Intro to Computing - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a list of numbers from 1 to 5.

Intro to Computing

numbers = [[1]]

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

A1, 2, 3, 4, 5

B1 2 3 4 5

C(1, 2, 3, 4, 5)

D{1, 2, 3, 4, 5}

Attempts:

3 left

💡 Hint

Common Mistakes

Using spaces instead of commas between numbers.

Using parentheses or curly braces instead of square brackets.

The correct way to create a list with specific elements is to use square brackets and separate the elements with commas.

2fill in blank

medium

Complete the code to access the third element in the list named 'fruits'.

Intro to Computing

third_fruit = fruits[[1]]

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

A2

B3

C1

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Using 3 as the index which is actually the fourth element.

Confusing list indexes with counting numbers.

List indexes start at 0, so the third element is at index 2.

3fill in blank

hard

Fix the error in the code to add the number 10 to the end of the list 'scores'.

Intro to Computing

scores.[1](10)

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

Ainsert

Bappend

Cadd

Dextend

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'add' which is not a list method.

Using 'insert' without specifying the position.

Using 'extend' which expects an iterable, not a single value.

The append method adds a single element to the end of a list.

4fill in blank

hard

Fill both blanks to create a list of squares for numbers 1 to 5.

Intro to Computing

squares = [x[1]2 for x in range(1, [2])]

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

A**

B+

C6

D-

Attempts:

3 left

💡 Hint

Common Mistakes

Using multiplication instead of exponentiation for squaring.

Using 5 in range which excludes the number 5.

Use the exponent operator ** to square numbers. The range function should go up to 6 to include 5.

5fill in blank

hard

Fill all three blanks to create a dictionary with words as keys and their lengths as values, only for words longer than 3 letters.

Intro to Computing

lengths = { [1] : [2] for [3] in words if len([3]) > 3 }

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

Aword

Blen(word)

Dlen(words)

Attempts:

3 left

💡 Hint

Common Mistakes

Using len(words) which is the length of the whole list, not each word.

Using different variable names inconsistently.

The dictionary comprehension uses word as the key, len(word) as the value, and iterates over words with the variable word. The condition filters words longer than 3 letters.