Why async improves performance in FastAPI - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define an async route handler in FastAPI.

FastAPI

from fastapi import FastAPI

app = FastAPI()

@app.get("/items")
async def get_items():
    return {"message": "Hello from [1] function!"}

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

Async

Basync

Cnormal

Dblocking

Attempts:

3 left

💡 Hint

Common Mistakes

Using a normal def function instead of async def

Forgetting to add async keyword before function

The route handler must be declared with async to enable asynchronous behavior in FastAPI.

2fill in blank

medium

Complete the code to await an async operation inside the route handler.

FastAPI

import asyncio
from fastapi import FastAPI

app = FastAPI()

@app.get("/wait")
async def wait_seconds():
    await [1](1)
    return {"message": "Waited 1 second"}

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

Aasyncio.sleep

Btime.sleep

Csleep

Dwait

Attempts:

3 left

💡 Hint

Common Mistakes

Using time.sleep which blocks the event loop

Not using await before the sleep call

Use await asyncio.sleep(1) to pause asynchronously without blocking the event loop.

3fill in blank

hard

Fix the syntax error in the route handler by completing the code correctly.

FastAPI

from fastapi import FastAPI

app = FastAPI()

@app.get("/data")
def [1]():
    return {"data": "sync function"}

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

Aget_data

Basync def get_data

Casync get_data

Dasync def get_data()

Attempts:

3 left

💡 Hint

Common Mistakes

Putting async def inside the blank which causes syntax error

Adding parentheses in the blank

To fix the syntax error, fill the function name get_data in the blank. The def and function name must be on the same line. Adding async def in the blank would cause a syntax error.

4fill in blank

hard

Fill both blanks to create a dictionary comprehension that filters async tasks with duration greater than 2.

FastAPI

tasks = {task: duration for task, duration in durations.items() if duration [1] 2 and task.startswith([2])}

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

A>

B"a"

C<

D"b"

Attempts:

3 left

💡 Hint

Common Mistakes

Using less than symbol which filters wrong tasks

Using wrong starting letter string

The comprehension filters tasks with duration greater than 2 and task names starting with "a".

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that maps uppercase task names to durations for tasks longer than 3 seconds.

FastAPI

result = [1]: [2] for [3], duration in durations.items() if duration > 3

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

Atask.upper()

Bduration

Ctask

Dduration.upper()

Attempts:

3 left

💡 Hint

Common Mistakes

Using duration.upper() which is invalid for numbers

Swapping key and value positions

The comprehension maps uppercase task names (task.upper()) to their durations for tasks longer than 3 seconds.