Polling as fallback in Flask - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the Flask class.

Flask

from flask import [1]

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

Arender_template

Bjsonify

CRequest

DFlask

Attempts:

3 left

💡 Hint

Common Mistakes

Importing Request instead of Flask

Using lowercase flask instead of Flask

The Flask class is imported from the flask module to create the app.

2fill in blank

medium

Complete the code to define a route that returns a JSON response.

Flask

@app.route('/status')
def status():
    return [1]({'status': 'ok'})

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

Ajsonify

Brequest

Credirect

Drender_template

Attempts:

3 left

💡 Hint

Common Mistakes

Using render_template instead of jsonify

Returning a dictionary directly without jsonify

The jsonify function converts a Python dictionary to a JSON response.

3fill in blank

hard

Fix the error in the polling loop to wait 2 seconds between requests.

Flask

import requests
import time

while True:
    response = requests.get('/status')
    if response.json().get('status') == 'ok':
        break
    time.[1](2)

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

Asleep

Bwait

Cpause

Ddelay

Attempts:

3 left

💡 Hint

Common Mistakes

Using time.wait which does not exist

Using time.pause or time.delay which are invalid

The time.sleep(seconds) function pauses the program for the given seconds.

4fill in blank

hard

Fill both blanks to create a polling endpoint that returns JSON with a message.

Flask

from flask import Flask, [1]

app = Flask(__name__)

@app.route('/poll')
def poll():
    return [2]({'message': 'Polling response'})

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

Ajsonify

Brequest

Drender_template

Attempts:

3 left

💡 Hint

Common Mistakes

Importing request instead of jsonify

Returning render_template instead of JSON

jsonify is imported and used to return JSON responses in Flask.

5fill in blank

hard

Fill all three blanks to create a polling loop that stops when server returns 'done'.

Flask

import requests
import time

while True:
    response = requests.get('[1]')
    if response.json().get('[2]') == '[3]':
        break
    time.sleep(1)

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

A/poll

Bstatus

Cdone

D/status

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong URL like '/poll'

Checking wrong JSON key or value

The polling URL is '/status', checking the 'status' key for the value 'done' to stop.