How to use the pcbdraw.pcbdraw.SvgPathItem.is_same function in PcbDraw

# Convert circle to path
                att = svg_element.attrib
                s = " M {0} {1} m-{2} 0 a {2} {2} 0 1 0 {3} 0 a {2} {2} 0 1 0 -{3} 0 ".format(
                    att["cx"], att["cy"], att["r"], 2 * float(att["r"]))
                path += s
    outline = [elements[0]]
    elements = elements[1:]
    while True:
        size = len(outline)
        for i, e in enumerate(elements):
            if SvgPathItem.is_same(outline[0].start, e.end):
                outline.insert(0, e)
            elif SvgPathItem.is_same(outline[0].start, e.start):
                e.flip()
                outline.insert(0, e)
            elif SvgPathItem.is_same(outline[-1].end, e.start):
                outline.append(e)
            elif SvgPathItem.is_same(outline[-1].end, e.end):
                e.flip()
                outline.append(e)
            else:
                continue
            del elements[i]
            break
        if size == len(outline):
            first = True
            for x in outline:
                path += x.format(first)
                first = False
            if elements:
                outline = [elements[0]]
                elements = elements[1:]

s = " M {0} {1} m-{2} 0 a {2} {2} 0 1 0 {3} 0 a {2} {2} 0 1 0 -{3} 0 ".format(
                    att["cx"], att["cy"], att["r"], 2 * float(att["r"]))
                path += s
    outline = [elements[0]]
    elements = elements[1:]
    while True:
        size = len(outline)
        for i, e in enumerate(elements):
            if SvgPathItem.is_same(outline[0].start, e.end):
                outline.insert(0, e)
            elif SvgPathItem.is_same(outline[0].start, e.start):
                e.flip()
                outline.insert(0, e)
            elif SvgPathItem.is_same(outline[-1].end, e.start):
                outline.append(e)
            elif SvgPathItem.is_same(outline[-1].end, e.end):
                e.flip()
                outline.append(e)
            else:
                continue
            del elements[i]
            break
        if size == len(outline):
            first = True
            for x in outline:
                path += x.format(first)
                first = False
            if elements:
                outline = [elements[0]]
                elements = elements[1:]
            else:
                e = etree.Element("path", d=path, style="fill-rule=evenodd;")

if svg_element.tag == "path":
                elements.append(SvgPathItem(svg_element.attrib["d"]))
            elif svg_element.tag == "circle":
                # Convert circle to path
                att = svg_element.attrib
                s = " M {0} {1} m-{2} 0 a {2} {2} 0 1 0 {3} 0 a {2} {2} 0 1 0 -{3} 0 ".format(
                    att["cx"], att["cy"], att["r"], 2 * float(att["r"]))
                path += s
    outline = [elements[0]]
    elements = elements[1:]
    while True:
        size = len(outline)
        for i, e in enumerate(elements):
            if SvgPathItem.is_same(outline[0].start, e.end):
                outline.insert(0, e)
            elif SvgPathItem.is_same(outline[0].start, e.start):
                e.flip()
                outline.insert(0, e)
            elif SvgPathItem.is_same(outline[-1].end, e.start):
                outline.append(e)
            elif SvgPathItem.is_same(outline[-1].end, e.end):
                e.flip()
                outline.append(e)
            else:
                continue
            del elements[i]
            break
        if size == len(outline):
            first = True
            for x in outline:
                path += x.format(first)
                first = False