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Buildpack: Python

This is the official Scalingo buildpack for Python apps, powered by Pipenv, pip and other excellent software.

Recommended web frameworks include Django and Flask, among others. The recommended webserver is Gunicorn. There are no restrictions around what software can be used (as long as it's pip-installable). Web processes must bind to $PORT, and only the HTTP protocol is permitted for incoming connections.

Python packages with C dependencies that are not available on the base image are generally not supported, unless manylinux wheels are provided by the package maintainers (common).

Application Requirements

A requirements.txt or Pipfile file must be present in the root (top-level) directory of your app's source code.

Configuration

Python Version

We recommend that you specify a Python version for your app rather than relying on the buildpack's default Python version.

For example, to request the latest patch release of Python 3.13, create a .python-version file in the root directory of your app containing: 3.13

The buildpack will look for a Python version in the following places (in descending order of precedence):

  1. runtime.txt file (deprecated)
  2. .python-version file (recommended)
  3. The python_full_version field in the Pipfile.lock file
  4. The python_version field in the Pipfile.lock file

If none of those are found, the buildpack will use a default Python version for the first build of an app, and then subsequent builds of that app will be pinned to that version unless the build cache is cleared or you request a different version.

The current default Python version is: 3.12

The supported Python versions are:

  • Python 3.13
  • Python 3.12
  • Python 3.11
  • Python 3.10

These Python versions are deprecated on Scalingo:

  • Python 3.9
  • Python 3.8 (only available on the scalingo-20 stack)

Python versions older than those listed above are no longer supported, since they have reached end-of-life upstream.

Documentation

For more information about using Python on Scalingo, see our documentation.