Async vs sync decision in FastAPI - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a synchronous FastAPI route handler.

FastAPI

from fastapi import FastAPI
app = FastAPI()

@app.get("/sync")
def [1]():
    return {"message": "Hello from sync"}

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

Aasync_handler

Bsync_handler

Chandle_async

Dasync_func

Attempts:

3 left

💡 Hint

Common Mistakes

Using async def for a synchronous route

Naming the function with async prefix when it's sync

The function is synchronous, so it should be a normal def function, here named sync_handler.

2fill in blank

medium

Complete the code to define an asynchronous FastAPI route handler.

FastAPI

from fastapi import FastAPI
app = FastAPI()

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

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

Ahandle_sync

Bsync_handler

Casync_handler

Dsync_func

Attempts:

3 left

💡 Hint

Common Mistakes

Using def instead of async def for async routes

Naming the function with sync prefix when it's async

Asynchronous route handlers use async def, so the function name async_handler fits the async style.

3fill in blank

hard

Fix the error in the async route handler by completing the code.

FastAPI

from fastapi import FastAPI
app = FastAPI()

@app.get("/data")
async def get_data():
    data = await [1]()
    return data

async def fetch_data():
    return {"info": "sample"}

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

Adata_fetch

Bget_data

Cfetch

Dfetch_data

Attempts:

3 left

💡 Hint

Common Mistakes

Awaiting a non-async function

Calling a function that does not exist

The await keyword must be used with an async function, here fetch_data().

4fill in blank

hard

Fill both blanks to create a dictionary comprehension that filters async results.

FastAPI

results = {item: value for item, value in data.items() if value [1] 10 and item.startswith([2])}

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

A>

B"a"

C<

D"z"

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong comparison operator

Forgetting quotes around string literals

The comprehension filters items with value greater than 10 and keys starting with "a".

5fill in blank

hard

Fill all three blanks to create an async function that fetches and filters data.

FastAPI

async def process_data():
    raw = await [1]()
    filtered = {k: v for k, v in raw.items() if v [2] 5 and k.[3]("b")}
    return filtered

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

Afetch_data

B>

Cstartswith

Dget_data

Attempts:

3 left

💡 Hint

Common Mistakes

Not awaiting the async function

Using wrong operators or methods in filtering

The async function awaits fetch_data(), then filters items with value greater than 5 and keys starting with "b".