Python Workers: FastMCP Example
This is an example of a Python Worker that uses the FastMCP 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.
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user_eJqPHRNe
2025-04-25
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