---
title: Packages
description: Manage and use Python packages in Cloudflare Workers with Pywrangler.
image: https://developers.cloudflare.com/dev-products-preview.png
---

> Documentation Index  
> Fetch the complete documentation index at: https://developers.cloudflare.com/workers/llms.txt  
> Use this file to discover all available pages before exploring further. 

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# Packages

[Pywrangler ↗](https://github.com/cloudflare/workers-py?tab=readme-ov-file#pywrangler) is a CLI tool for managing packages and Python Workers. It is meant as a wrapper for wrangler that sets up a full environment for you, including bundling your packages into your worker bundle on deployment.

To get started, create a pyproject.toml file with the following contents:

TOML

```
[project]name = "YourProjectName"version = "0.1.0"description = "Add your description here"requires-python = ">=3.13"dependencies = [    "fastapi"]
[dependency-groups]dev = [  "workers-py",  "workers-runtime-sdk"]
```

The above will allow your worker to depend on the [FastAPI ↗](https://fastapi.tiangolo.com/) package.

To run the worker locally:

```
uv run pywrangler dev
```

To deploy your worker:

```
uv run pywrangler deploy
```

Your dependencies will get bundled with your worker automatically on deployment.

The `pywrangler` CLI also supports all commands supported by the `wrangler` tool, for the full list of commands run `uv run pywrangler --help`.

## Supported Libraries

Python Workers support pure and [PyEmscripten ↗](https://peps.python.org/pep-0783/) Python packages on [PyPI ↗](https://pypi.org/). Additionally, Python Workers support packages that are included in [Pyodide ↗](https://pyodide.org/en/stable/usage/packages-in-pyodide.html).

WebAssembly support for Python packages is still in early stages, and some packages may not yet be available as PyEmscripten wheels on PyPI. If a package you would like to use is not yet available, we encourage you to reach out to the package maintainers and request PyEmscripten wheels. You can also start a thread in the [Python Packages Discussions ↗](https://github.com/cloudflare/workerd/discussions/categories/python-packages)on the Cloudflare Workers Runtime GitHub repository — we would be happy to help you communicate with package maintainers.

## HTTP Client Libraries

Only HTTP libraries that are able to make requests asynchronously are supported. Currently, these include [aiohttp ↗](https://docs.aiohttp.org/en/stable/index.html) and [httpx ↗](https://www.python-httpx.org/). You can also use the [fetch() API](https://developers.cloudflare.com/workers/runtime-apis/fetch/) from JavaScript, using Python Workers' [foreign function interface](https://developers.cloudflare.com/workers/languages/python/ffi) to make HTTP requests.

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```