GoKawiilWe introduced Python Workers two years ago, providing a way to run Python applications in the Cloudflare Workers runtime. Our goal was to make it as simple to write Workers in Python as it is in TypeScript, and to make the ecosystem of Python packages and frameworks “just work”.
Today, Python Workers are now generally available (GA).
What does GA mean? It means Python is now a first-class, fully supported language on the Cloudflare Developer Platform. You can bring the Python code, libraries, and design patterns you already know and connect them seamlessly to Workers AI, R2, D1, Hyperdrive, Durable Objects, Queues, Workflows, and the rest of the Cloudflare platform. You can also run popular Python frameworks like FastAPI, Django, and Flask inside Python Workers. You can even create a Python Worker inside another Worker using Dynamic Workers .
from fastapi import FastAPI, Request from workers import asgi, WorkerEntrypoint app = FastAPI() @app.get ( "/" ) async def root (request: Request): env = request.scope[ "env" ] return await env. AI .run( "@cf/openai/gpt-oss-120b" , { "instructions" : "You are a friendly assistant." , "input" : "What is the origin of the phrase Hello, World?" , }, ) Default = asgi.entrypoint(app)
The journey behind Python Workers
Bringing Python to Cloudflare Workers was a natural choice. Because Workers has supported WebAssembly since 2018 , it gave us the perfect environment to run a Wasm-compiled Python interpreter. By using Pyodide , we were able to quickly support a wide range of Python applications in Cloudflare Workers.
Our goal was to create the first platform for infinitely scalable Python apps, while making it as easy and performant as developing Python apps anywhere else.
The features we are highlighting today are the result of this multi-year effort. Many developers are already building applications within Python Workers; today, we are making these capabilities production-ready for everyone.
Python is now a first-class language in the Cloudflare Workers runtime
Python Workers now natively support Cloudflare Developer Platform bindings. Previously, using these Cloudflare bindings in Python Workers required converting Python objects into TypeScript objects explicitly at the RPC boundary. For example, sending a Python dictionary into a Cloudflare Queue required the following glue code to work:
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