User authentication basics in Raspberry Pi - Mini Project: Build & Apply

User authentication basics

📖 Scenario: You are building a simple user login system for a Raspberry Pi project. The system will check if a username and password match stored data to allow access.

🎯 Goal: Create a program that stores user credentials, sets a username and password to check, verifies if the credentials match, and prints a message showing if login is successful or not.

📋 What You'll Learn

Create a dictionary with usernames as keys and passwords as values

Create variables for input username and password to check

Use an if statement to verify if the username exists and the password matches

Print 'Login successful' if credentials match, otherwise print 'Login failed'

💡 Why This Matters

🌍 Real World

User authentication is essential for controlling access to devices like Raspberry Pi projects, home automation, or personal servers.

💼 Career

Understanding basic authentication helps in roles like system administration, IoT development, and software engineering where security is important.

1

Create user credentials dictionary

Create a dictionary called users with these exact entries: 'alice': 'wonderland', 'bob': 'builder', 'carol': 'sunshine'

Raspberry Pi

# Create the users dictionary with usernames and passwords
# Your code here

Need a hint?

Use curly braces {} to create a dictionary with keys and values separated by colons.

2

Set username and password to check

Create two variables called username and password and set them to 'bob' and 'builder' respectively

Raspberry Pi

users = {'alice': 'wonderland', 'bob': 'builder', 'carol': 'sunshine'}
# Set username and password variables
# Your code here

Need a hint?

Assign the exact strings to the variables using the equals sign.

3

Check if username and password match

Write an if statement that checks if username is a key in users and if users[username] equals password

Raspberry Pi

users = {'alice': 'wonderland', 'bob': 'builder', 'carol': 'sunshine'}
username = 'bob'
password = 'builder'
# Check credentials with if statement
# Your code here

Need a hint?

Use in to check if the username exists and compare the stored password with the input password.

4

Print login result

Write a print statement that prints 'Login successful' if login_success is True, otherwise prints 'Login failed'

Raspberry Pi

users = {'alice': 'wonderland', 'bob': 'builder', 'carol': 'sunshine'}
username = 'bob'
password = 'builder'
if username in users and users[username] == password:
    login_success = True
else:
    login_success = False
# Print login result
# Your code here

Need a hint?

Use an if statement to print the correct message based on the login_success variable.