>>> from ipaddress import ip_network
>>> L = [ipaddress.ip_network(x) for x in ['ff00::/8', 'fd00::/8', '172.16.0.0/12', '10.0.0.0/8']]
>>> L.sort()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python3.5/ipaddress.py", line 652, in __lt__
    self, other))
TypeError: 10.0.0.0/8 and fd00::/8 are not of the same version