Please don't loose time trying yet another sandbox inside CPython. It's just a waste of time. It's broken by design.
Please read my email about my attempt (pysandbox): https://lwn.net/Articles/574323/ And the LWN article: https://lwn.net/Articles/574215/ There are a lot of safe ways to run CPython inside a sandbox (and not rhe opposite). I started as you, add more and more things to a blacklist, but it doesn't work. See pysandbox test suite for a lot of ways to escape a sandbox. CPython has a list of know code to crash CPython (I don't recall the dieectory in sources), even with the latest version of CPython. Victor
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