Raymond Hettinger firstname.lastname@example.org added the comment:
Please give Niel a chance to submit wording, even a post here on the tracker will be fine. We usually defer to the person who actually encountered the issue.
If after a week or so, there is no response, you can pick this up. Try to be minimal with it and avoid the temptation to go gonzo. The "from" part of exception semantics is one of its most minor and easily ignored features. Accordingly, it should get minimal space in the tutorial and probably doesn't even warrant an example if a simple, clear sentence will suffice.