Why real-time matters in Flask - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the Flask class.

Flask

from flask import [1]
app = [1](__name__)

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

Arender_template

BFlask

CRequest

Dredirect

Attempts:

3 left

💡 Hint

Common Mistakes

Importing Request instead of Flask

Using render_template in place of Flask

Forgetting to import Flask

The Flask class is imported to create the app instance.

2fill in blank

medium

Complete the code to define a route that returns 'Hello World!'.

Flask

@app.route('/')
def home():
    return [1]

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

A'Hello World!'

Brender_template('index.html')

Credirect('/')

Djsonify(message='Hello World!')

Attempts:

3 left

💡 Hint

Common Mistakes

Returning a function call instead of a string

Forgetting quotes around the string

Using redirect instead of returning text

The route function returns a simple string 'Hello World!'.

3fill in blank

hard

Fix the error in the code to run the Flask app.

Flask

if __name__ == '__main__':
    app.[1](debug=True)

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

Aexecute

Bstart

Crun

Dlaunch

Attempts:

3 left

💡 Hint

Common Mistakes

Using start() instead of run()

Calling execute() which does not exist

Forgetting parentheses after run

The Flask app is started using the run() method.

4fill in blank

hard

Fill both blanks to create a real-time message update using Flask-SocketIO.

Flask

from flask_socketio import SocketIO
socketio = SocketIO(app)

@socketio.[1]('[2]')
def handle_message(msg):
    print('Message:', msg)

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

Aemit

Bsend

Con

Dconnect

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'emit' as decorator instead of 'on'

Using 'connect' event instead of 'send'

Confusing 'send' with 'emit' in decorator

The decorator @socketio.on('send') listens for 'send' events.

Flask-SocketIO uses 'on' to register event handlers.

5fill in blank

hard

Fill all three blanks to emit a real-time event to clients.

Flask

from flask_socketio import emit

@app.route('/notify')
def notify():
    [1]('notification', [2]={'msg': 'Update!'}, [3]=True)
    return 'Notified'

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

Aemit

Bdata

Cbroadcast

Dsend

Attempts:

3 left

💡 Hint

Common Mistakes

Using send instead of emit

Passing message as a string instead of dictionary

Forgetting broadcast=True to notify all clients

The emit function sends an event named 'notification'.

The data argument is a dictionary with the message.

The broadcast=True option sends to all connected clients.