Why error handling 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'

Ajsonify

BFlask

Crender_template

DRequest

Attempts:

3 left

💡 Hint

Common Mistakes

Importing Request instead of Flask

Using jsonify as the app class

The Flask class is imported to create the app instance.

2fill in blank

medium

Complete the code to define a route that returns a simple message.

Flask

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

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

AHello World!

Bjsonify(message='Hello World!')

Crender_template('index.html')

D'Hello World!'

Attempts:

3 left

💡 Hint

Common Mistakes

Returning unquoted text

Returning a function call instead of string

The return value must be a string, so it needs quotes.

3fill in blank

hard

Fix the error in the code to handle a 404 error with a custom message.

Flask

@app.errorhandler([1])
def not_found(error):
    return 'Page not found', 404

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

A404

B403

C500

D400

Attempts:

3 left

💡 Hint

Common Mistakes

Using 500 for server error instead of 404

Using 403 for forbidden

404 is the HTTP status code for 'Not Found'.

4fill in blank

hard

Fill in the blank to create a route that raises a 404 error manually.

Flask

from flask import abort

@app.route('/secret')
def secret():
    [1](404)
    return 'This is a secret page.'

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

Aabort

Breturn

Craise

Dprint

Attempts:

3 left

💡 Hint

Common Mistakes

Using raise instead of abort

Using return to send error code

The abort function is used to raise HTTP errors in Flask.

5fill in blank

hard

Fill all three blanks to handle errors and return JSON with error info.

Flask

from flask import jsonify

@app.errorhandler([1])
def handle_error(error):
    response = jsonify({'error': str(error)})
    response.status_code = [2]
    return [3]

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

A404

Bresponse

Cerror.code

D500

Attempts:

3 left

💡 Hint

Common Mistakes

Hardcoding status code incorrectly

Returning error instead of response

The handler catches 404 errors, sets the response code from error.code, and returns the response object.