Serverless computing basics in Intro to Computing - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a serverless function that returns a greeting message.

Intro to Computing

def handler(event, context):
    return [1]

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

Aevent + context

Bprint("Hello from serverless!")

Creturn "Hello from serverless!"

D"Hello from serverless!"

Attempts:

3 left

💡 Hint

Common Mistakes

Including 'return' inside the blank again causes syntax errors.

Using print instead of returning the message.

The serverless function should return a string as the output. Using return "Hello from serverless!" inside the function is correct, but since the code already has return, the blank should be just the string. So option D is correct.

2fill in blank

medium

Complete the code to extract the 'name' value from the event dictionary in a serverless function.

Intro to Computing

def handler(event, context):
    name = event[1]
    return f"Hello, {name}!"

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

A("name")

B["name"]

C.name

D{'name'}

Attempts:

3 left

💡 Hint

Common Mistakes

Using parentheses instead of square brackets.

Using dot notation which doesn't work for dictionaries.

In Python, to get a value from a dictionary, you use square brackets with the key as a string. So event["name"] is correct.

3fill in blank

hard

Fix the error in the serverless function code to correctly check if the event has a 'user' key.

Intro to Computing

def handler(event, context):
    if [1] in event:
        return "User found"
    else:
        return "User not found"

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

A'user'

Buser

C"user"

Devent['user']

Attempts:

3 left

💡 Hint

Common Mistakes

Using unquoted user causes NameError.

Using event['user'] in the condition causes a KeyError if key missing.

When checking if a key exists in a dictionary, the key must be a string in quotes. Both single and double quotes work, but since the code uses double quotes outside, single quotes inside avoid confusion. So 'user' is correct.

4fill in blank

hard

Fill both blanks to create a serverless function that returns the length of a list passed in the event under 'items'.

Intro to Computing

def handler(event, context):
    items = event[1]
    count = [2](items)
    return count

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

A["items"]

Blen

C("items")

Dcount

Attempts:

3 left

💡 Hint

Common Mistakes

Using parentheses instead of square brackets for dictionary access.

Using variable name 'count' instead of the function 'len'.

The function first extracts the list from the event dictionary using event["items"]. Then it uses the len() function to get the number of items in the list.

5fill in blank

hard

Fill all three blanks to create a serverless function that filters even numbers from a list in the event under 'numbers' and returns the filtered list.

Intro to Computing

def handler(event, context):
    numbers = event[1]
    evens = [num for num in numbers if num [2] 2 == 0]
    return [3]

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

A["numbers"]

B%

Cevens

D==

Attempts:

3 left

💡 Hint

Common Mistakes

Using parentheses instead of square brackets for dictionary access.

Using wrong operator instead of modulo '%'.

Returning the original list instead of the filtered list.

The function gets the list from the event using event["numbers"]. It then uses a list comprehension to keep numbers where num % 2 == 0 (even numbers). Finally, it returns the filtered list stored in evens.