Inngest Python SDK: Durable Background Jobs for FastAPI, Flask, and Django

Inngest’s Python SDK is presented as a managed, event-driven alternative to Celery-style background-job systems for Python 3.10+ applications using FastAPI, Flask, Django, Tornado, and DigitalOcean Functions. It enables developers to define sync or async durable functions triggered by events or cron schedules, with automatic retries, step-level checkpointing and memoization, long delays without occupied threads, waits for external events, parallel execution, and configurable concurrency, rate limits, and debouncing without operating Redis, a broker, or separate workers. The article demonstrates integrating an HTTP handler into existing web applications, sending events from synchronous or asynchronous code, using a local development server and visual run explorer, and deploying through ordinary HTTPS-based application hosting, including serverless platforms. It compares Inngest favorably with Celery and ARQ for workflow durability, observability, event waiting, and infrastructure simplicity, while acknowledging dependence on Inngest’s managed cloud platform, with enterprise self-hosting available. Suggested applications include ecommerce automations, webhook handling, AI pipelines, scheduled work, and incremental migrations from Celery; the SDK also supports Pydantic, typed code, direct testing of core logic, recovery after redeployments, and payload-size limits that encourage storing large data externally.

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