What is Flask - Practice Questions & Exercises

Challenge - 5 Problems

🧠 Conceptual

intermediate

What is Flask used for?

Flask is a popular tool in Python. What is its main purpose?

A To manage databases directly without code

B To build websites and web apps easily with Python

C To create desktop applications with graphical interfaces

D To analyze data and create charts

💡 Hint

Think about what web developers need to create websites.

Flask is a lightweight web framework in Python. It helps developers build web applications by providing tools to handle web requests and responses.

🧠 Conceptual

intermediate

Which feature is NOT part of Flask?

Flask provides many features. Which one is NOT included by default?

A Routing to handle different web pages

B Support for handling HTTP requests and responses

C Template rendering to create HTML pages

D Built-in database ORM (Object Relational Mapper)

💡 Hint

Flask is minimal and lets you add extra tools as needed.

Flask does not include a built-in ORM. Developers can add ORMs like SQLAlchemy separately.

❓ component_behavior

advanced

What happens when you run this Flask code?

Consider this Flask app code. What will the browser show when visiting '/'?

Flask

from flask import Flask
app = Flask(__name__)

@app.route('/')
def home():
    return 'Hello, Flask!'

if __name__ == '__main__':
    app.run()

A The browser shows the text: Hello, Flask!

B The browser shows a 404 Not Found error

C The browser shows a blank page

D The server crashes with an error

💡 Hint

Look at the route decorator and the returned string.

The route '/' is linked to the home function, which returns 'Hello, Flask!'. Visiting '/' shows this text.

📝 Syntax

advanced

Identify the syntax error in this Flask snippet

Which option correctly fixes the syntax error in this Flask code? from flask import Flask app = Flask(__name__) @app.route('/') def home() return 'Hi!' app.run()

A Add parentheses to app.run like app.run()

B Change @app.route('/') to @app.route('/home')

C Add a colon after def home():

D Indent the return statement one level less

💡 Hint

Check the function definition line carefully.

Python function definitions require a colon at the end of the def line. Missing colon causes SyntaxError.

❓ lifecycle

expert

What is the order of events when a Flask app handles a web request?

Put these steps in the correct order when Flask processes a web request: 1. Flask calls the view function 2. Browser sends HTTP request 3. Flask sends HTTP response back 4. Flask matches URL to route

A 1,2,3,4

B 1,3,2,4

C 2,1,3,4

D 1,2,4,3

💡 Hint

Think about what happens first: the browser sends a request or Flask matches routes?

First, the browser sends the HTTP request. Then Flask matches the URL to a route, calls the view function, and finally sends the response.