This is a warning that just about every Twisted user is going to see and it's confusing (_sslverify.py? what?) and poorly formatted.
I can definitely fix the formatting (and maybe a few other things in this area...) for a new prerelease.
But how would you recommend we make the warning come from a more sensible location that doesn't mention _sslverify.py? I'd really like this to look specific, comprehensible, and actionable to users. Should it not be using the warnings module?
-glyph