Choosing the right data structure in Intro to Computing - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a list that can store multiple items.

Intro to Computing

my_collection = [1]

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

A[]

B{}

C()

D''

Attempts:

3 left

💡 Hint

Common Mistakes

Using curly braces creates a set or dictionary, not a list.

Using parentheses creates a tuple, which is similar but not the same.

Lists in programming are like shopping bags where you can put many items in order. The square brackets [] create an empty list.

2fill in blank

medium

Complete the code to add a new item to the end of the list.

Intro to Computing

my_list = [1, 2, 3]
my_list.[1](4)

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

Ainsert

Bextend

Cadd

Dappend

Attempts:

3 left

💡 Hint

Common Mistakes

Using insert requires a position index.

Using add is for sets, not lists.

Using extend adds multiple items from another list.

The append method adds a single item to the end of a list, like putting a new book at the end of a shelf.

3fill in blank

hard

Fix the error in the code to access the value for key 'name' in the dictionary.

Intro to Computing

person = {'name': 'Alice', 'age': 30}
print(person[1]'name')

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

A(

B[

C{

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using parentheses causes a syntax error.

Curly braces are for creating dictionaries, not accessing values.

Dictionaries use square brackets [] to access values by their keys, like looking up a word in a dictionary book.

4fill in blank

hard

Complete the code to create a dictionary comprehension that maps words to their lengths for words longer than 3 letters.

Intro to Computing

{word: len(word) for word in words if len(word) [1] 3}

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

A:

B>

C<

D=

Attempts:

3 left

💡 Hint

Common Mistakes

Using = instead of : causes syntax errors.

Using < filters shorter words, not longer.

In dictionary comprehensions, : separates keys and values. The condition > filters words longer than 3 letters.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that maps uppercase keys to their values for items with positive values.

Intro to Computing

result = [1]: [2] for k, v in data.items() if v [3] 0}

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

Ak.upper()

Bv

C>

Dk

Attempts:

3 left

💡 Hint

Common Mistakes

Using k instead of k.upper() keeps keys unchanged.

Using < filters negative values, not positive.

This comprehension creates keys in uppercase using k.upper(), keeps values as v, and filters items with values greater than zero using >.