Can I use any Python library with Cloudflare Workers?

You can use pure Python packages and Pyodide-compatible packages. Native C extensions that haven't been compiled for WebAssembly are not supported.

Is FastAPI supported on Cloudflare Python Workers?

Yes, FastAPI can work by routing requests through a WorkerEntrypoint, though it is currently in beta and limited to async-only endpoints.

How do Python Workflows differ from standard Workers?

Workflows provide durable execution for multi-step tasks, automatically persisting state between steps and allowing for retries, sleep cycles, and complex automation.

Do I need to use async code in my Worker?

Yes, Cloudflare Python Workers are async-only. You must use asynchronous libraries like httpx or aiohttp instead of synchronous ones like requests to avoid blocking the event loop.

What is the recommended way to handle dependencies?

This skill recommends using 'uv' for package management and maintaining a 'pyproject.toml' file to ensure dependencies are correctly bundled for the Pyodide runtime.

Cloudflare Python Workers

Name: Cloudflare Python Workers
Author: jezweb

byjezweb

•

Cloud Infrastructure

Builds and deploys high-performance Python serverless APIs and durable workflows on Cloudflare Workers using the modern WorkerEntrypoint pattern.

Cloudflare Python Workers enables developers to run Python 3.12+ applications on the edge using the Pyodide runtime. This skill streamlines the development of serverless APIs, providing optimized patterns for the WorkerEntrypoint class, multi-step durable Workflows with automatic state persistence, and seamless integration with Cloudflare services like D1, KV, and Workers AI. It specifically prevents common pitfalls such as async errors, package compatibility issues, and outdated handler patterns, ensuring a smooth transition for Python developers moving to edge computing.

Key Features

0191 GitHub stars

02Provides standardized access to Cloudflare bindings including D1, KV, R2, and Workers AI.

03Implements the modern WorkerEntrypoint class-based pattern for robust edge handlers.

04Automates project initialization and deployment using the uv package manager and pywrangler CLI.

05Enables JavaScript FFI for accessing native browser and edge APIs directly from Python code.

06Configures durable Python Workflows with multi-step DAG automation and @step.do decorators.

Use Cases

01Integrating Python-based AI models and vector databases into edge-ready web applications.

02Automating long-running, multi-step business logic with durable stateful Workflows.

03Building serverless REST APIs and microservices using Python on the edge.

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add jezweb/claude-skills cloudflare-python-workers

For use in Claude.ai and ChatGPT

Download Skill