Quadrilateral bounding box to LabelImg xml generation

create_labimg_xml.py

import numpy as np
from pathlib import Path
import xml.etree.cElementTree as ET
from PIL import Image


def create_labimg_xml(image_path, annotation_list):

    image_path = Path(image_path)
    img = np.array(Image.open(image_path).convert('RGB'))

    annotation = ET.Element('annotation')
    ET.SubElement(annotation, 'folder').text = str(image_path.parent.name)
    ET.SubElement(annotation, 'filename').text = str(image_path.name)
    ET.SubElement(annotation, 'path').text = str(image_path)

    source = ET.SubElement(annotation, 'source')
    ET.SubElement(source, 'database').text = 'Unknown'

    size = ET.SubElement(annotation, 'size')
    ET.SubElement(size, 'width').text = str (img.shape[1])
    ET.SubElement(size, 'height').text = str(img.shape[0])
    ET.SubElement(size, 'depth').text = str(img.shape[2])

    ET.SubElement(annotation, 'segmented').text = '0'

    for annot in annotation_list:
        tmp_annot = annot.split(',')
        cords, label = tmp_annot[0:-2], tmp_annot[-1]
        xmin, ymin, xmax, ymax = cords[0], cords[1], cords[4], cords[5]

        object = ET.SubElement(annotation, 'object')
        ET.SubElement(object, 'name').text = label
        ET.SubElement(object, 'pose').text = 'Unspecified'
        ET.SubElement(object, 'truncated').text = '0'
        ET.SubElement(object, 'difficult').text = '0'

        bndbox = ET.SubElement(object, 'bndbox')
        ET.SubElement(bndbox, 'xmin').text = str(xmin)
        ET.SubElement(bndbox, 'ymin').text = str(ymin)
        ET.SubElement(bndbox, 'xmax').text = str(xmax)
        ET.SubElement(bndbox, 'ymax').text = str(ymax)

    tree = ET.ElementTree(annotation)
    xml_file_name = image_path.parent / (image_path.name.split('.')[0]+'.xml')
    tree.write(xml_file_name)


# ----------------------------------------------------------------------------------
anotation_list = ['291,473,385,481,383,504,289,496,Hello',
                  '270,507,330,507,330,516,270,516,SUPERLATIVE']

create_labimg_xml('data/demo.jpg', anotation_list)

Suggest to use this code in the end.
it will save the xml in pretty view.

just need to delete next lines:
tree = ET.ElementTree(annotation)
tree.write(xml_file_name)

and after the line:
xml_file_name = image_path.parent / (image_path.name.split('.')[0]+'.xml')

past this lines:
import xml.dom.minidom as minidom
xmlstr = minidom.parseString(ET.tostring(annotation)).toprettyxml(indent=" ")
with open(xml_file_name, "w") as tree:
tree.write(xmlstr)