`extension.cp39-win_amd64.pyd` `extension.cpython-39-x86_64-linux-gnu.so` `extension.cpython-39-darwin.so` etc xref: https://github.com/python-project-templates/python-template-rust/issues/59
extension.cp39-win_amd64.pydextension.cpython-39-x86_64-linux-gnu.soextension.cpython-39-darwin.soetc
xref: python-project-templates/python-template-rust#59