It's duct tape and bailing wire. And we love it for that.
If the app is useful enough, it might even get cleaned up. Or just more duct tape and bailing wire is applied, more likely. :-)
(Or else, if you want to play this game, there is PyPy's sandboxing, which is just an unpolished proof a concept so far. I can challenge anyone to attack it, and this time it includes attempts to consume too much time or memory, to crash the process in any other way than a clean "fatal error!" message, and more generally to exploit issues that are dismissed by pysandbox as irrelevant.)
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