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Python Workers

Cloudflare Workers provides a first-class Python experience, including support for:

Introduction

A Python Worker can be as simple as four lines of code:

Python
from workers import WorkerEntrypoint, Response


class Default(WorkerEntrypoint):
    async def fetch(self, request):
        return Response("Hello World!")

Similar to other Workers, the main entry point for a Python worker is the fetch handler which handles incoming requests sent to the Worker.

In a Python Worker, this handler is placed in a Default class that extends the WorkerEntrypoint class (which you can import from the workers SDK module).

The pywrangler CLI tool

To run a Python Worker locally, install packages, and deploy it to Cloudflare, you use pywrangler ↗, the CLI for Python Workers.

To set it up, first, ensure uv ↗ and Node ↗ are installed.

Then set up your development environment:

Terminal window
uvx --from workers-py pywrangler init

This will create a pyproject.toml file with workers-py as a development dependency. pywrangler init will create a wrangler config file. You can then run pywrangler with:

Terminal window
uv run pywrangler dev

To deploy a Python Worker to Cloudflare, run pywrangler deploy:

Terminal window
uv run pywrangler deploy

Python Worker Templates

When you initialize a new Python Worker project and select from one of many templates:

Terminal window
uv run pywrangler init

Or you can clone the examples repository to explore more options:

Terminal window
git clone https://github.com/cloudflare/python-workers-examples
cd python-workers-examples/01-hello

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