Why routing is Flask's core - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a route in Flask that shows 'Hello World!'.

Flask

from flask import Flask
app = Flask(__name__)

@app.route([1])
def hello():
    return 'Hello World!'

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

A"/hello"

B"hello"

C"/"

D"home"

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting the leading slash in the route path.

Using a string without quotes.

The @app.route decorator defines the URL path. It must start with a slash, so "/hello" is correct.

2fill in blank

medium

Complete the code to run the Flask app only if the script is executed directly.

Flask

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

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

A"main"

B"__init__"

C"__main__"

D"start"

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'main' without underscores.

Using '__init__' which is for package initialization.

The special variable __name__ equals "__main__" when the script is run directly, so this condition ensures the app runs only then.

3fill in blank

hard

Fix the error in the route decorator to correctly map the URL '/about'.

Flask

@app.route([1])
def about():
    return 'About page'

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

A"/about"

B"about"

C'about/'

D'about'

Attempts:

3 left

💡 Hint

Common Mistakes

Omitting the leading slash in the route string.

Using single quotes inconsistently.

The route path must start with a slash / to be valid, so "/about" is correct.

4fill in blank

hard

Fill both blanks to create a route that accepts a username parameter and returns a greeting.

Flask

@app.route([1])
def greet_user([2]):
    return f"Hello, {username}!"

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

A"/user/<username>"

Buser

Cusername

D"/username"

Attempts:

3 left

💡 Hint

Common Mistakes

Not matching the parameter name in the route and function.

Forgetting angle brackets around the parameter in the route.

The route must include the parameter in angle brackets, and the function must accept the same parameter name.

5fill in blank

hard

Fill all three blanks to create a route that returns a JSON response with a message and status code.

Flask

from flask import jsonify

@app.route([1])
def status():
    response = [2]({{"message": "OK"}})
    response.status_code = [3]
    return response

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

A"/status"

Bjsonify

C200

D"status"

Attempts:

3 left

💡 Hint

Common Mistakes

Using a string instead of an integer for status code.

Forgetting to import or use jsonify.

The route path is "/status", jsonify creates a JSON response, and 200 is the HTTP status code for OK.