Flask Basics - 60 MCQs

Which command starts a Flask app in debug mode?

• app.run()

• app.run(debug=True)

• flask debug

• python debug app.py

What decorator is used to define a route in Flask?

• @url

• @route

• @app.route

• @path

What does methods=['POST'] in a Flask route do?

• Allows both GET and POST

• Restricts the route to only POST requests

• Restricts the route to only GET requests

• Converts all requests to POST

What happens if you visit /save in the browser when it only allows POST?

• It shows a success message

• It saves empty data

• It raises a Method Not Allowed error

• It redirects to /get

Which object is used to access form data sent in a POST request?

• session

• request.form

• render_template_string

• json.load

What does @app.route('/') define?

• The error handler

• The homepage (root route)

• The session storage

• The database connection

What does return render_template_string() do?

• Loads a template file from /templates

• Renders raw HTML given as a string

• Returns plain text only

• Reads an HTML file from disk

Which Flask object must be set to enable sessions?

• session.key

• app.secret_key

• request.secret

• os.environ['SECRET']

In the in-memory example, what data structure is used?

• List

• Set

• Dictionary

• Tuple

What happens to in-memory data when the server restarts?

• It persists

• It is lost

• It is stored in a file

• It goes to the session