Redis with Python (redis-py) - Mini Project: Build & Apply

Simple Redis Key-Value Store with Python

📖 Scenario: You are building a simple key-value store using Redis and Python. This store will hold user information such as usernames and their favorite colors. Redis is a fast, in-memory database often used for caching and quick data retrieval.

🎯 Goal: Build a Python script that connects to Redis, stores user data as key-value pairs, retrieves the data, and finally deletes the keys to clean up.

📋 What You'll Learn

Create a Redis connection using redis-py

Store multiple user favorite colors as key-value pairs

Retrieve and print the stored values

Delete the keys from Redis

💡 Why This Matters

🌍 Real World

Redis is widely used for caching user preferences and session data in web applications for fast access.

💼 Career

Understanding how to use Redis with Python is valuable for backend developers working on scalable, high-performance applications.

1

Connect to Redis and set up initial data

Import the redis module and create a Redis client called r that connects to localhost on the default port. Then, create a dictionary called user_colors with these exact entries: 'alice': 'blue', 'bob': 'green', 'carol': 'red'.

Redis

# Import redis and create Redis client r
# Create dictionary user_colors with keys 'alice', 'bob', 'carol' and their favorite colors
# Your code here

Need a hint?

Use redis.Redis() to connect. The dictionary keys and values must match exactly.

2

Store user colors in Redis

Use a for loop with variables user and color to iterate over user_colors.items(). Inside the loop, use r.set(user, color) to store each user's favorite color in Redis.

Redis

import redis

r = redis.Redis(host='localhost', port=6379, db=0)

user_colors = {'alice': 'blue', 'bob': 'green', 'carol': 'red'}

# Use a for loop to store each user and color in Redis
# Your code here

Need a hint?

Use for user, color in user_colors.items(): and inside the loop call r.set(user, color).

3

Retrieve and decode user colors from Redis

Create an empty dictionary called retrieved_colors. Use a for loop with variable user to iterate over user_colors.keys(). Inside the loop, get the color from Redis using r.get(user), decode it to a string with .decode('utf-8'), and store it in retrieved_colors[user].

Redis

import redis

r = redis.Redis(host='localhost', port=6379, db=0)

user_colors = {'alice': 'blue', 'bob': 'green', 'carol': 'red'}

for user, color in user_colors.items():
    r.set(user, color)

# Create retrieved_colors dictionary and fill it by getting and decoding values from Redis
# Your code here

Need a hint?

Remember Redis returns bytes, so decode with .decode('utf-8').

4

Delete the user keys from Redis

Use a for loop with variable user to iterate over user_colors.keys(). Inside the loop, delete each key from Redis using r.delete(user).

Redis

import redis

r = redis.Redis(host='localhost', port=6379, db=0)

user_colors = {'alice': 'blue', 'bob': 'green', 'carol': 'red'}

for user, color in user_colors.items():
    r.set(user, color)

retrieved_colors = {}
for user in user_colors.keys():
    retrieved_colors[user] = r.get(user).decode('utf-8')

# Delete all user keys from Redis
# Your code here

Need a hint?

Use r.delete(user) inside the loop to remove keys.