How to use the pyclipper.ClipperException function in pyclipper

def union(paths1, paths2):
    if not paths1:
        return paths2
    if not paths2:
        return paths1
    pc = pyclipper.Pyclipper()
    if paths1:
        if paths1[0][0] in (int, float):
            raise pyclipper.ClipperException()
        paths1 = pyclipper.scale_to_clipper(paths1, SCALING_FACTOR)
        pc.AddPaths(paths1, pyclipper.PT_SUBJECT, True)
    if paths2:
        if paths2[0][0] in (int, float):
            raise pyclipper.ClipperException()
        paths2 = pyclipper.scale_to_clipper(paths2, SCALING_FACTOR)
        pc.AddPaths(paths2, pyclipper.PT_CLIP, True)
    try:
        outpaths = pc.Execute(pyclipper.CT_UNION, pyclipper.PFT_EVENODD, pyclipper.PFT_EVENODD)
    except:
        print("paths1={}".format(paths1))
        print("paths2={}".format(paths2))
    outpaths = pyclipper.scale_from_clipper(outpaths, SCALING_FACTOR)
    return outpaths

def union(paths1, paths2):
    if not paths1:
        return paths2
    if not paths2:
        return paths1
    pc = pyclipper.Pyclipper()
    if paths1:
        if paths1[0][0] in (int, float):
            raise pyclipper.ClipperException()
        paths1 = pyclipper.scale_to_clipper(paths1, SCALING_FACTOR)
        pc.AddPaths(paths1, pyclipper.PT_SUBJECT, True)
    if paths2:
        if paths2[0][0] in (int, float):
            raise pyclipper.ClipperException()
        paths2 = pyclipper.scale_to_clipper(paths2, SCALING_FACTOR)
        pc.AddPaths(paths2, pyclipper.PT_CLIP, True)
    try:
        outpaths = pc.Execute(pyclipper.CT_UNION, pyclipper.PFT_EVENODD, pyclipper.PFT_EVENODD)
    except:
        print("paths1={}".format(paths1))
        print("paths2={}".format(paths2))
    outpaths = pyclipper.scale_from_clipper(outpaths, SCALING_FACTOR)
    return outpaths

pc.AddPath(clipContour, pyclipper.PT_CLIP)
        except pyclipper.ClipperException:
            # skip invalid paths with no area
            if pyclipper.Area(clipContour) == 0:
                raise InvalidClippingContourError("contour %d is invalid for clipping" % j)

    bounds = pc.GetBounds()
    if (bounds.bottom, bounds.left, bounds.top, bounds.right) == (0, 0, 0, 0):
        # do nothing if there are no paths
        return []

    try:
        solution = pc.Execute(_operationMap[operation],
                              _fillTypeMap[subjectFillType],
                              _fillTypeMap[clipFillType])
    except pyclipper.ClipperException as exc:
        raise ExecutionError(exc)

    return [[tuple(p) for p in path] for path in solution]

useful to remove inners which have collapsed to points or lines, which can
    interfere with the cleaning process.
    """

    # drop all degenerate inners
    clean_shape = _drop_degenerate_inners(shape)

    pc = pyclipper.Pyclipper()

    try:
        pc.AddPaths(_coords(clean_shape), pyclipper.PT_SUBJECT, True)

        # note: Execute2 returns the polygon tree, not the list of paths
        result = pc.Execute2(pyclipper.CT_UNION, pyclipper.PFT_EVENODD)

    except pyclipper.ClipperException:
        return MultiPolygon([])

    return _polytree_to_shapely(result)