import xml.etree.ElementTree as ET
import csv
import sys
file_name_xml = sys.argv[1]
file_name_csv = sys.argv[2]
tree = ET.parse(file_name_xml)
root = tree.getroot()

with open(file_name_csv, 'wb') as csvfile:
    spamwriter = csv.writer(csvfile)
    for neighbor in root.iter('DATI'):
        parent = neighbor.attrib.get("ISTANTE")
        parent = parent[:-4]
        number = len(neighbor.getchildren())
        if number > 1:
            vm = neighbor[0].text
            vmin = neighbor[1].text
            vmax = neighbor[2].text
        else:
            vm = "NA"
            vmin = "NA"
            vmax = "NA"
        spamwriter.writerow([parent, vm, vmin, vmax])