build_py.py 文件源码

def assert_relative(path):
    if not os.path.isabs(path):
        return path
    from distutils.errors import DistutilsSetupError

    msg = textwrap.dedent("""
        Error: setup script specifies an absolute path:

            %s

        setup() arguments must *always* be /-separated paths relative to the
        setup.py directory, *never* absolute paths.
        """).lstrip() % path
    raise DistutilsSetupError(msg)