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Python SDK — Development

Contributor guide for building and testing the runanywhere Python package from source.

Prerequisites

  • Python 3.9+
  • A C++20 toolchain and CMake (for the native _core extension)
  • Built or co-located runanywhere-commons sources (scikit-build-core drives CMake)

Editable install

The SDK builds via scikit-build-core, which compiles the native _core extension from runanywhere-commons.

cd bindings/python
pip install -e ".[test]"

Tests

pytest tests

The suite includes pure-Python tests that fake the native core, so you can run many tests without a full native build.

Architecture notes

  • The compiled native runtime loads lazily on the first initialize(), so importing runanywhere is side-effect-free.
  • Multiple RunAnywhere clients share one reference-counted underlying runtime.
  • See AGENTS.md in this directory for the full architecture, build details, and lazy-load design.