What is the difference between the second and the third answer?

I think this is a bad solution, because you re-set the whole entry for key 1 again. Why not use the following?

people[1]['last_name'] = 'Dactill'

Well, technically speaking none of the answers is correct, because the variable is named

Username

which by the way violates PEP8 😛

Yes, looks good now. Thanks a lot, Grant!

Care to elaborate on the reason?

Seems legit.

If this is helpful: I head over to https://www.sqlservercentral.com/questions and the link at the end ("Join the discussion") points to https://www.sqlservercentral.com/?post_type=topic&p=3715247. If I click on the according link in...

No need to worry, Grant. I just found it weird, this never happened before and now twice in a week. I'm not that great forum poster that I need that...

Nope, sorry, still not working. I'm speaking about "Join the discussion and add your comment" link at the end of the answered page. This also happened last week with https://www.sqlservercentral.com/questions/xact_state-trancount-and-rollback,...

Slightly-OT: I think the discussion link for the 2020-02-11 QotD ("Execution Plan Types") is wrong, it currently points to this editorial. Could someone please fix that?

Ahhh, I smell an upcoming question where the single and double quotes are changed 😉

No, I only see NVARCHAR there, too. But this article talks about VARCHAR

Normally I would not use a regexp for such a simple task, two splits and a for loop is enough and much more readable:

for i in str.split("\n")[1:]:
...

Am I blind? What's the difference between answer 2 and 3?
BTW: Nice question. I always have to look up the substring syntax in any programming language. Even if I did...