How to use the svglib.utils.normalise_svg_path function in svglib

"3.502-1.865 3.918-.773.201-1.488.127-2.659-.281-1.438-.502-1.684-.494-2.405.058"
             "-1.618 1.239-3.869 1.355-5.894.299z",
                ['m', [246.026, 120.178], 'c', [-0.558, -0.295, -1.186, -0.768, -1.395, -1.054],
                 'c', [-0.314, -0.438, -0.132, -0.456, 1.163, -0.104],
                 'c', [2.318, 0.629, 3.814, 0.383, 5.298, -0.873],
                 'l', [1.308, -1.103], 'l', [1.54, 0.784],
                 'c', [0.848, 0.428, 1.748, 0.725, 2.008, 0.656],
                 'c', [0.667, -0.176, 2.05, -1.95, 2.005, -2.564],
                 'c', [-0.054, -0.759, 0.587, -0.568, 0.896, 0.264],
                 'c', [0.615, 1.631, -0.281, 3.502, -1.865, 3.918],
                 'c', [-0.773, 0.201, -1.488, 0.127, -2.659, -0.281],
                 'c', [-1.438, -0.502, -1.684, -0.494, -2.405, 0.058],
                 'c', [-1.618, 1.239, -3.869, 1.355, -5.894, 0.299],
                 'z', []]),
        )
        failed = _testit(utils.normalise_svg_path, mapping)
        assert len(failed) == 0

def convertPath(self, node):
        d = node.getAttribute('d')
        if not d:
            return None
        normPath = normalise_svg_path(d)
        path = Path()
        points = path.points
        # Track subpaths needing to be closed later
        unclosed_subpath_pointers = []
        subpath_start = []
        lastop = ''

        for i in range(0, len(normPath), 2):
            op, nums = normPath[i:i+2]

            if op in ('m', 'M') and i > 0 and path.operators[-1] != _CLOSEPATH:
                unclosed_subpath_pointers.append(len(path.operators))

            # moveto absolute
            if op == 'M':
                path.moveTo(*nums)