Python

What the generated Dockerfile does for a Python project, when you set no build or start command.

With a requirements.txt, pip installs the dependencies.

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The picture shows which package manager installs the dependencies.

The defaults

Step	What Ferry does
Base image	The base image is `python:<version>-slim`. The version comes from `.python-version` or `runtime.txt` (`python-3.11.4`). The default is 3.12.
Install with `requirements.txt`	`pip install -r requirements.txt`
Install with `pyproject.toml`	uv when there is a `uv.lock`. Poetry for Poetry projects. If not, `pip install .` or the dependencies of the project.
Install with `Pipfile`	Pipenv
Build	None by default. Your build command runs after the install.
Start	`python main.py`. If that file is not there, `python app.py`.

For a full generated file, see the example.

Node.js

What the generated Dockerfile does for a Node.js project, when you set no build or start command.

What the generated Dockerfile does for a Go project, when you set no build or start command.