Flask web server on Raspberry Pi - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is Flask in the context of a Raspberry Pi?

Flask is a small and simple web framework for Python that lets you create web servers easily on a Raspberry Pi to handle web requests and show web pages.

beginner

How do you install Flask on a Raspberry Pi?

You open the terminal and run: pip install flask. This command downloads and installs Flask so you can use it in your Python programs.

beginner

What is the purpose of the @app.route('/') decorator in a Flask app?

It tells Flask which web address (URL) should run the function below it. For example, @app.route('/') means the function runs when someone visits the home page.

intermediate

Why do you use app.run(host='0.0.0.0') on a Raspberry Pi?

Using host='0.0.0.0' makes the Flask server listen on all network addresses, so other devices on the same network can access the web server running on the Raspberry Pi.

beginner

What is a simple Flask app example to show 'Hello, Raspberry Pi!' on the home page?

from flask import Flask
app = Flask(__name__)

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

if __name__ == '__main__':
    app.run(host='0.0.0.0')
 This code creates a web server that shows the message when you visit the Pi's IP address.

What command installs Flask on a Raspberry Pi?

A apt-get install flask

B python flask install

C npm install flask

D pip install flask

Flask is a Python package installed using pip, so the correct command is pip install flask.

What does @app.route('/') do in a Flask app?

A Defines the home page URL route

B Starts the Flask server

C Imports Flask module

D Stops the Flask server

The @app.route('/') decorator tells Flask which URL path runs the function below it, here the home page.

Why use host='0.0.0.0' in app.run() on Raspberry Pi?

A To install Flask

B To allow access from other devices on the network

C To disable the server

D To run the server only on localhost

Setting host='0.0.0.0' makes the server listen on all network interfaces, so other devices can connect.

Which language is Flask written in?

A Python

B JavaScript

C Java

D C++

Flask is a web framework written in Python.

What do you need to do before running a Flask app on Raspberry Pi?

A Format the SD card

B Install Node.js

C Install Flask using pip

D Install Java

You must install Flask with pip before running Flask apps.

Explain how to create and run a simple Flask web server on a Raspberry Pi.

Think about installation, coding, running, and accessing the server.

Describe why setting the host to '0.0.0.0' is important when running Flask on Raspberry Pi.

Consider how devices on the same network reach the server.