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Python Workers: FastAPI-MCP Example

This is an example of a Python Worker that uses the FastAPI-MCP package.

Adding Packages

Vendored packages are added to your source files and need to be installed in a special manner. The Python Workers team plans to make this process automatic in the future, but for now, manual steps need to be taken.

Vendoring Packages

First, install Python3.12 and pip for Python 3.12.

Currently, other versions of Python will not work - use 3.12!

Then create a virtual environment and activate it from your shell:

python3.12 -m venv .venv
source .venv/bin/activate

Within our virtual environment, install the pyodide CLI:

.venv/bin/pip install pyodide-build
.venv/bin/pyodide venv .venv-pyodide

Lastly, download the vendored packages. For any additional packages, re-run this command.

.venv-pyodide/bin/pip install -t src/vendor -r vendor.txt

Developing and Deploying

To develop your Worker, run npx wrangler@latest dev.

To deploy your Worker, run npx wrangler@latest deploy.