Builds a wheel, places it in wheel_directory

def build_wheel(wheel_directory, config_settings=None, metadata_directory=None):
    """Builds a wheel, places it in wheel_directory"""
    poetry = Poetry.create(".")

    return unicode(
        WheelBuilder.make_in(
            poetry, SystemEnv(Path(sys.prefix)), NullIO(), Path(wheel_directory)
        )
    )