Sets - Quiz

Complete the code to create a set of unique user IDs from the given list of IDs

Complete the code to check if a product code already exists in the inventory set

Complete the code to get all unique tags used across two blog posts

Which statement correctly creates an empty set of email addresses?

You have a set of usernames. Which property of sets is most useful to avoid duplicate registrations?

Which method would you use to add several new permissions from a list to an existing permissions set?

Which operation returns items that are in set_a but not in set_b?

You want to safely remove a user ID from a set without raising an error if it is missing. Which method should you use?

Which choice correctly describes a frozenset?

Which operation is valid on both set and frozenset objects?

You have two sets of attendees: morning_session and afternoon_session. Which operation gives attendees who joined both sessions?

What is the main benefit of using a frozenset as a dictionary key?

Which expression converts a string of tags into a set of unique characters?

Order the steps to collect unique error codes from a list and then check if a specific code is present.

Drag and drop to reorder, or use the arrows.

Order the steps to use a frozenset of allowed roles as a dictionary key for caching permissions.

Drag and drop to reorder, or use the arrows.

What is the output of this code?

1tags = {'python', 'backend', 'api'}
2print('python' in tags)

What is the output of this code?

1a = {1, 2, 3}
2b = {3, 4}
3print(a & b)

What is the output of this code?

1emails = {'a@example.com', 'b@example.com'}
2emails.add('a@example.com')
3print(len(emails))

What is the output of this code?

1numbers = {1, 2, 3, 4}
2removed = numbers.discard(5)
3print(numbers)

What is the output of this code?

1features = frozenset(['login', 'signup', 'profile'])
2print('login' in features)

This function is supposed to remove a user from a set of active_users without raising an error if the user is not present. Find the bug.

Click on the line(s) that contain the bug.

def deactivate_user(active_users, user_id):

    if user_id not in active_users:

        active_users.remove(user_id)

    return active_users

This code tries to use a set of tags as a dictionary key for caching results. Find the bug.

Click on the line(s) that contain the bug.

def cache_result(cache, tags, result):

    key = set(tags)

    cache[key] = result

    return cache

Match each set method/operator with what it does in a notification system.

Click an item on the left, then click its match on the right. Click a matched item to unmatch.

Match each type with its correct description related to sets.

Click an item on the left, then click its match on the right. Click a matched item to unmatch.

Complete the code to build a set of unique visitors from a list, then freeze it for use as a dictionary key.

Complete the code to add multiple new skills to a developer_skills set, then remove an obsolete skill safely.

Click the line that attempts to modify an immutable frozenset of roles.

Click on the line to select.

roles = frozenset(['admin', 'editor'])

roles_set = {'viewer'}

roles_set.add('guest')

roles.add('guest')

Click the line where a set is incorrectly used as a dictionary key.

Click on the line to select.

favorite_colors = {'red', 'blue'}

color_ratings = {}

color_ratings[favorite_colors] = 5

print(color_ratings)