I'm playing with pywikibot. I have a mediawiki on my local machine, for testing.

Traceback (most recent call last):
  File "simple.py", line 27, in <module>
    url="http://127.0.0.1/mw/index.php/")
  File "/home/phil/sproj/wfbots/venv/local/lib/python2.7/site-packages/pywikibot/__init__.py", line 1214, in Site
    raise SiteDefinitionError("Unknown URL '{0}'.".format(url))
pywikibot.exceptions.SiteDefinitionError: Unknown URL 'http://127.0.0.1/mw/index.php/'.
<class 'pywikibot.exceptions.SiteDefinitionError'>
CRITICAL: Closing network session.

Looking at the documentation, it says <https://doc.wikimedia.org/pywikibot/api_ref/pywikibot.html#pywikibot.Site>:

url (string) – Instead of code and fam, does try to get a Site based on the URL. Still requires that the family supporting that URL exists.

From this I get the impression that pywikibot has a list of mediawiki sites that it recognises, and if a site isn't on that list, it won't work.

Is that correct or am I misunderstanding something?