Welcome to the first lesson of our Redis course! In this unit, we'll start with the very basics — connecting to a Redis server. Understanding how to establish this connection is essential since it forms the backbone of all the operations you'll perform with Redis. By the end of this lesson, you’ll be confident in setting up a connection to a Redis server and verifying that connection through simple operations.

In this lesson, you will learn how to:

1. Connect to a Redis server using Python.
2. Verify your connection by storing and retrieving a value.

Here’s the simple code you’ll be working with:

Python
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1import redis
2
3# Connect to the Redis server
4client = redis.Redis(host='localhost', port=6379, db=0)
5
6# Verify the connection by setting and getting a value
7client.set('name', 'Redis Learner')
8print(f"Stored string in Redis: {client.get('name').decode('utf-8')}")

Let's break down the code:

• We import the redis module, which provides the Python interface to Redis.
• We establish a connection to the Redis server running on localhost at port 6379 and database 0 - the default database.
• We set a key-value pair in Redis using the set method, where the key is 'name' and the value is 'Redis Learner'.
• Finally, we retrieve the value stored in Redis using the get method and print it to the console. Notice that we decode the value using decode('utf-8') to convert it from bytes to a string, otherwise the byte string b'Redis Learner' would be printed. Note, that if we try to retrieve a key that doesn't exist, Redis will return None.

Establishing a connection to a Redis server is the first step in using the various features Redis has to offer, from fast data access to caching and message brokering. Without this fundamental step, you wouldn't be able to use Redis effectively. Knowing how to connect to a Redis server will enable you to start experimenting with Redis's powerful features, such as data structures and atomic operations.

Ready to get started? Let's dive into the practice section and make sure you can connect to a Redis server seamlessly.