import xml.etree.ElementTree as ET
import csv
tree = ET.parse('data.xml')
root = tree.getroot()





with open('data.csv', 'wb') as csvfile:
    spamwriter = csv.writer(csvfile)
    for neighbor in root.iter('DATI'):
        parent = neighbor.attrib.get("ISTANTE")
        temp = ""
        for child in neighbor:
            temp = temp + child.text + ","
        temp = temp[:-1]
        spamwriter.writerow([parent, temp])