Die Tagesdifferenz, die dein Skript liefert, kannst du aber trotzdem mit dem time-Modul rausbekommen:

import time
secs1 = time.mktime((2002, 5, 4, 17, 45, 0, 0, 0, 0))
secs2 = time.mktime((2003, 6, 2, 19, 7, 0, 0, 0, 0))
diff = secs2 - secs1
days = diff / 86400 # diff / 60 / 60 / 24
>>> print ...