How to use the svgpathtools.path.is_path_segment function in svgpathtools

# append directory to filename (if not included)
    if os_path.dirname(filename) == '':
        filename = os_path.join(getcwd(), filename)

    # append time stamp to filename
    if timestamp:
        fbname, fext = os_path.splitext(filename)
        dirname = os_path.dirname(filename)
        tstamp = str(time()).replace('.', '')
        stfilename = os_path.split(fbname)[1] + '_' + tstamp + fext
        filename = os_path.join(dirname, stfilename)

    # check paths and colors are set
    if isinstance(paths, Path) or is_path_segment(paths):
        paths = [paths]
    if paths:
        if not colors:
            colors = [_default_path_color] * len(paths)
        else:
            assert len(colors) == len(paths)
            if isinstance(colors, str):
                colors = str2colorlist(colors,
                                       default_color=_default_path_color)
            elif isinstance(colors, list):
                for idx, c in enumerate(colors):
                    if is3tuple(c):
                        colors[idx] = "rgb" + str(c)

    # check nodes and nodes_colors are set (node_radii are set later)
    if nodes:

def big_bounding_box(paths_n_stuff):
    """Finds a BB containing a collection of paths, Bezier path segments, and
    points (given as complex numbers)."""
    bbs = []
    for thing in paths_n_stuff:
        if is_path_segment(thing) or isinstance(thing, Path):
            bbs.append(thing.bbox())
        elif isinstance(thing, complex):
            bbs.append((thing.real, thing.real, thing.imag, thing.imag))
        else:
            try:
                complexthing = complex(thing)
                bbs.append((complexthing.real, complexthing.real,
                            complexthing.imag, complexthing.imag))
            except ValueError:
                raise TypeError(
                    "paths_n_stuff can only contains Path, CubicBezier, "
                    "QuadraticBezier, Line, and complex objects.")
    xmins, xmaxs, ymins, ymaxs = list(zip(*bbs))
    xmin = min(xmins)
    xmax = max(xmaxs)
    ymin = min(ymins)

if not text_path:
                pos = complex(xmin + margin_size*dx, ymin + margin_size*dy)
                text_path = [Line(pos, pos + 1).d()]
        else:
            if font_size:
                if isinstance(font_size, list):
                    assert len(font_size) == len(text)
                else:
                    font_size = [font_size] * len(text)
            else:
                font_size = [_default_font_size] * len(text)
        for idx, s in enumerate(text):
            p = text_path[idx]
            if isinstance(p, Path):
                ps = p.d()
            elif is_path_segment(p):
                ps = Path(p).d()
            else:  # assume this path, p, was input as a Path d-string
                ps = p

            # paragraph = dwg.add(dwg.g(font_size=font_size[idx]))
            # paragraph.add(dwg.textPath(ps, s))
            pathid = 'tp' + str(idx)
            dwg.defs.add(dwg.path(d=ps, id=pathid))
            txter = dwg.add(dwg.text('', font_size=font_size[idx]))
            txter.add(txt.TextPath('#'+pathid, s))

    if paths2Drawing:
        return dwg
      
    # save svg
    if not os_path.exists(os_path.dirname(filename)):

if svg_attributes is not None:
        dimensions = (svg_attributes.get("width", dimensions[0]),
                      svg_attributes.get("height", dimensions[1]))
        debug = svg_attributes.get("debug", svgwrite_debug)
        dwg = Drawing(filename=filename, size=dimensions, debug=debug,
                      **svg_attributes)
    else:
        dwg = Drawing(filename=filename, size=dimensions, debug=svgwrite_debug,
                      viewBox=viewbox)

    # add paths
    if paths:
        for i, p in enumerate(paths):
            if isinstance(p, Path):
                ps = p.d()
            elif is_path_segment(p):
                ps = Path(p).d()
            else:  # assume this path, p, was input as a Path d-string
                ps = p

            if attributes:
                good_attribs = {'d': ps}
                for key in attributes[i]:
                    val = attributes[i][key]
                    if key != 'd':
                        try:
                            dwg.path(ps, **{key: val})
                            good_attribs.update({key: val})
                        except Exception as e:
                            warn(str(e))

                dwg.add(dwg.path(**good_attribs))