def writeToFile (self, rfid, nameofchip, numberofchip) :
doc = ElementTree(file = self.__filename);
root = doc.getroot()
for chips in root.getchildren():
chipid = int((chips.find('chip-id')).text)
if chipid == rfid : #if id is already in the xml, delete the tuple
root.remove(chips)
#create the new Element for the ElementTree
chip = xmltree.Element('chips')
chip_id = xmltree.Element('chip-id')
chip_id.text = ElementTree.__str__(rfid)
name = xmltree.Element('name')
name.text = nameofchip
numbers = xmltree.Element('numbers')
numbers.text = ElementTree.__str__(numberofchip)
chip.insert(0, chip_id)
chip.insert(1, name)
chip.insert(2, numbers)
# and append it to the existing tree
root.append(chip)
xmltree.ElementTree(root).write(self.__filename)
