This happened quite recently, I did not know about that. Earlier I always read the  SVN notifies but since this spring I had no time for that. Anyhow, this is not a general expectation to bot owners. I think we should generally re-think our communication, and have a proper noticeboard or newsletter with the essence of talks and updates.

Agree.

I cannot reproduce this:

>>> raise wikipedia.LockedPage('something')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
pywikibot.exceptions.LockedPage: something

I don't know the difference but it should be tested from a script rather than command line.
I never see such messages, although I tried to define some myself.>

Good to hear you have solved the problem - and sorry that it wasted
that much time. But please also take from this that you should be
prepared for exceptions when saving - you want to handle the
exceptions in a sensible way, so the bot doesn't crash, wasting your
time :-)

Well, it's my fault. I wasn't prepared for a locked page as the bot works on these pages for users' wish and they have no reason to prevent bot of updating the page and I met this new case for the first time. I will be more careful (but the error was really not easy to understand).

Cheers and happy new year