Redis Py 7 4 0

redis-py 7.4

Overview

redis-py is the official Python client for Redis, the in-memory data store. Version 7.4 supports Python 3.10+ and works with Redis 7.2 through 8.2. It provides a complete Python interface to all Redis commands, including support for standalone, cluster, and sentinel deployments, both synchronous and asynchronous (asyncio) modes, pipelines, pub/sub, Lua scripting, distributed locking, retry logic with configurable backoff strategies, RESP3 protocol features including client-side caching, native OpenTelemetry metrics integration, and access to Redis modules (Bloom, Cuckoo, Count-Min Sketch, TopK, JSON, Search, TimeSeries).

Key capabilities:

• Full Redis command coverage via CoreCommands mixin
• Async support through redis.asyncio
• Cluster mode via redis.cluster.RedisCluster
• Connection pooling with configurable retry and backoff
• Pipeline batching for reduced round-trips
• Pub/Sub messaging
• Lua scripting with automatic cache management
• Distributed locking (redis.lock.Lock)
• RESP3 protocol (default from redis-py 8.0+)
• Client-side caching
• Native OpenTelemetry metrics
• Credential providers for dynamic authentication
• SSL/TLS connections with OCSP validation

When to Use

• Building Python applications that need Redis connectivity for caching, session storage, or message brokering
• Implementing async Redis clients with asyncio
• Working with Redis Cluster deployments requiring automatic slot-based routing
• Batching commands through pipelines for performance optimization
• Setting up pub/sub messaging patterns
• Running Lua scripts atomically on the Redis server
• Implementing distributed locks across processes or machines
• Integrating OpenTelemetry observability into Redis-dependent services
• Using Redis modules for probabilistic data structures, JSON operations, full-text search, or time series
• Configuring retry logic with exponential backoff for resilient connections

Core Concepts

Client instances are thread-safe — Redis objects can be shared across threads. Connections are retrieved from the pool during command execution and returned immediately after. However, PubSub and Pipeline objects are not thread-safe.

Connection pools — Each Redis instance owns its own ConnectionPool by default. Share pools across clients using the connection_pool parameter, or use Redis.from_pool() for exclusive ownership.

Response decoding — By default, responses are returned as bytes. Set decode_responses=True to receive decoded strings.

Protocol versions — RESP3 is the default from redis-py 8.0+. Use protocol=3 for RESP3 or protocol=2 for RESP2 on earlier versions. RESP3 provides better performance with fewer type translations and supports new response types (doubles, maps, booleans, push notifications).

SELECT command not exposed — redis-py does not implement SELECT on client instances because it creates pool contamination. Use separate Redis instances (and pools) per database.

Advanced Topics

Connecting to Redis: Connection methods, URL schemes, SSL/TLS, credential providers, connection pools → Connecting to Redis

Async Support: Asyncio client patterns, async pipelines, pub/sub, and connection lifecycle → Async Support

Cluster Mode: Redis Cluster client, target nodes, cluster pipelines, and multi-key commands → Cluster Mode

Pipelines and Transactions: Command batching, WATCH/MULTI/EXEC patterns, and the transaction helper → Pipelines and Transactions

Pub/Sub and Streams: Channel subscription, pattern matching, stream operations, and consumer groups → Pub/Sub and Streams

Lua Scripting: Script registration, EVAL/EVALSHA, pipeline integration, and cluster limitations → Lua Scripting

Distributed Locking: The Lock class, acquire/release patterns, extension, and ownership checks → Distributed Locking

Retry and Backoff: Retry strategies, backoff algorithms, cluster retry behavior → Retry and Backoff

RESP3 Features: Push notifications, client-side caching, response unification → RESP3 Features

OpenTelemetry Integration: Native metrics collection, OTelConfig, metric groups → OpenTelemetry Integration

Redis Modules: Bloom/Cuckoo filters, JSON, Search, TimeSeries commands → Redis Modules

Exceptions: Error types, cluster-specific errors, and handling patterns → Exceptions