python/pyproject.toml

[build-system]
requires = [
    "setuptools",
    "wheel",
    # Cython 3.x requires Python >= 3.7; use the legacy 0.29.x series for 2.7/3.6.
    "Cython==0.29.37; python_version < '3.7'",
    "Cython==3.0.11; python_version >= '3.7'",
]
build-backend = "setuptools.build_meta"