Lists - Quiz

Access the last element of the tasks list without using its length directly

Create a sublist of the first three elements from the scores list

Add several new log entries from another list to the end of the existing logs list

Which statement correctly creates an empty list to store user IDs?

You need an ordered, changeable collection of product names. Which type is most suitable?

Given prices = [10.0, 20.5, 30.0], which expression accesses 20.5?

What does orders[1:4] return for orders = ['a', 'b', 'c', 'd', 'e']?

Which method removes and returns the last item from a list of messages?

Which list method is best to add a single new task at the end of todo_list?

Which is a valid list comprehension to create a list of doubled values from data?

Given grades = [[80, 90], [70, 75]], what is grades[0][1]?

You have logs = ['start', 'process', 'end']. Which operation changes 'process' to 'process_ok'?

What does this list comprehension build? usernames = [name.lower() for name in raw_names]

Which slicing expression reverses the list history?

Order the steps to create a list of squared even numbers from an existing list numbers using a list comprehension, then show how many squares were created.

Drag and drop to reorder, or use the arrows.

Order the steps to build a nested list representing a 2x2 grid initialized with zeros and then update one cell.

Drag and drop to reorder, or use the arrows.

What is the output of this code?

1scores = [10, 20, 30, 40]
2print(scores[-2])

What is the output of this code?

1data = [1, 2, 3, 4, 5]
2sub = data[1:4]
3print(len(sub))

What is the output of this code?

1items = ['a', 'b', 'c']
2items.append('d')
3print(items[2])

What is the output of this code?

1numbers = [1, 2, 3, 4]
2result = [n * 2 for n in numbers if n > 2]
3print(result)

What is the output of this code?

1matrix = [[1, 2], [3, 4]]
2value = matrix[0][0] + matrix[1][1]
3print(value)

Find the bug in this code that extracts the last three log entries from a list.

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

def last_three_logs(logs):

    # Return the last three entries from logs

    slice_logs = logs[3:]

    return slice_logs

Find the bug in this code that sums all values in a nested list of daily_sales.

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

def total_sales(daily_sales):

    total = 0

    for day in daily_sales:

        total += day

    return total

Match each list method with what it does when managing a shopping cart list.

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

Match each list-related concept with its example.

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 list of squared temperatures (in Celsius) that are above freezing from a readings list.

Complete the code to extract the middle row from a 3x3 matrix stored as a nested list and compute its average.

Click the line that uses list slicing to skip every other element.

Click on the line to select.

data = [10, 20, 30, 40, 50]

first_three = data[:3]

step_slice = data[::2]

last_two = data[-2:]

Click the line that accesses an element from a nested list.

Click on the line to select.

rows = [[1, 2], [3, 4], [5, 6]]

second_row = rows[1]

value = rows[2][0]

length = len(rows)