>>> import pwb, pywikibot as py
>>> s = py.Site()
>>> x = s.interwiki_prefix(s)
Traceback (most recent call last):
File "<pyshell#3>", line 1, in <module>
x = s.interwiki_prefix(s)
File "pywikibot\site.py", line 969, in interwiki_prefix
prefixes.update(self._interwikimap.get_by_url(url))
File "pywikibot\site.py", line 712, in get_by_url
return set(prefix for prefix, iw_entry in self._iw_sites
File "pywikibot\site.py", line 713, in <genexpr>
if iw_entry.url == url)
AttributeError: 'unicode' object has no attribute 'url'Seems it was never used in 3,5 years.