Check for free planet slots on positions 7-9 on ogame uni122

uni122.py

#!/usr/bin/env python
import requests
from xml.etree import ElementTree

url = 'http://s122-es.ogame.gameforge.com/api/universe.xml'

response = requests.get(url)

universe = ElementTree.fromstring(response.content)

SAVE = {}

def is_free(solar_system, position):
    return not SAVE[solar_system][position]

for elem in universe.getchildren():
    galaxy, solar_system, position = elem.attrib['coords'].split(':')
    if int(galaxy) == 2:
        if int(solar_system) not in SAVE:
            SAVE[int(solar_system)] = [False for x in range(0, 17)]

        SAVE[int(solar_system)][int(position)] = True

for key, solar in SAVE.iteritems():
    if is_free(key, 7):
        print('2:{}:7 is free!'.format(key))
    if is_free(key, 8):
        print('2:{}:8 is free!'.format(key))
    if is_free(key, 9):
        print('2:{}:9 is free!'.format(key))