>>> import pywikibot
>>> s = pywikibot.Site(fam='wikisource')
>>> x = s.get_known_families()
WARNING: <pyshell#9>:1: FutureWarning: pywikibot.family.Family.get_known_families is deprecated for 5 years; use APISite.interwiki instead.

WARNING: C:\pwb\GIT\core\pywikibot\family.py:753: FutureWarning: known_families is deprecated for 5 years and 6 months; use APISite.interwiki(prefix) instead.
  return self.known_families

>>> s = pywikibot.Site(fam='wikipedia')
>>> x = s.get_known_families()
Traceback (most recent call last):
  File "<pyshell#11>", line 1, in <module>
    x = s.get_known_families()
  File "C:\pwb\GIT\core\pywikibot\families\wikipedia_family.py", line 224, in get_known_families
    if site.code == 'sv':
AttributeError: 'str' object has no attribute 'code'
>>>