pywikibot compat is broken since mediawiki release 1.28 due to login error. [1]
Deprecation of compat was announced long time ago [2][3][4][5][and some others]. I guess
it is time to close this branch now.
Anyway if one wants to fix this breaker, do it. Personally I would not like to investigate
deeper in this matter and keeping compat still alive.
Greetings
xqt
[1]
https://phabricator.wikimedia.org/T150613
[2]
https://www.mediawiki.org/w/index.php?title=Manual:Pywikibot/Version_table&…
[3]
https://www.mediawiki.org/w/index.php?title=Manual:Pywikibot/Compat/depreca…
[4]
https://phabricator.wikimedia.org/T99365
[5]
https://phabricator.wikimedia.org/T101524