Migrating to async Flask - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

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

Flask

from flask import Flask
app = Flask(__name__)

@app.route('/')
async def [1]():
    return 'Hello, async Flask!'

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

Ahome

Bindex

Cmain

Droot

Attempts:

3 left

💡 Hint

Common Mistakes

Using a synchronous function instead of async

Naming the function something unrelated

The async route handler function is named index here, which is a common name for the main page.

2fill in blank

medium

Complete the code to await an async function inside an async Flask route.

Flask

import asyncio
from flask import Flask
app = Flask(__name__)

async def fetch_data():
    await asyncio.sleep(1)
    return 'data'

@app.route('/data')
async def get_data():
    result = await [1]()
    return result

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

Afetch

Bget_data

Cfetch_data

Ddata_fetch

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting to use await

Calling a wrong function name

The async function fetch_data is awaited inside the route handler.

3fill in blank

hard

Fix the error in the async Flask route by completing the decorator.

Flask

from flask import Flask
app = Flask(__name__)

[1]('/async')
async def async_route():
    return 'Async route works!'

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

[e-mail]

[e-mail]_route

[e-mail]

[e-mail]

Attempts:

3 left

💡 Hint

Common Mistakes

Using a non-existent decorator like @app.async

Using @app.async_route which is invalid

The correct decorator for routes in Flask is @app.route, which supports async functions in modern Flask versions.

4fill in blank

hard

Fill both blanks to create an async Flask route that returns JSON asynchronously.

Flask

from flask import Flask, jsonify
app = Flask(__name__)

@app.route('/json')
async def json_route():
    data = await [1]()
    return [2](data)

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

Afetch_data

Bjsonify

Cjson

Dget_data

Attempts:

3 left

💡 Hint

Common Mistakes

Using json instead of jsonify

Not awaiting the async function

The async function fetch_data is awaited to get data, then jsonify converts it to JSON response.

5fill in blank

hard

Fill all three blanks to define an async Flask route that calls two async functions and returns combined results.

Flask

from flask import Flask, jsonify
app = Flask(__name__)

async def fetch_user():
    return {'user': 'Alice'}

async def fetch_status():
    return {'status': 'active'}

@app.route('/combined')
async def combined_route():
    user = await [1]()
    status = await [2]()
    result = {**user, **[3]
    return jsonify(result)

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

Afetch_user

Bfetch_status

Cstatus

Duser

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up variable names in the merge

Not awaiting both async functions

The route awaits fetch_user and fetch_status, then merges the dictionaries with status to return combined JSON.