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    <p>The rough consensus on this is that the complexity and introspection abilities of CPython make for <a href="http://mail.python.org/pipermail/python-dev/2012-March/117175.html" rel="nofollow">unreliable attempts</a> of blacklisting parts of the interpreter. I believe one of the major attempts was tav's <a href="http://tav.espians.com/a-challenge-to-break-python-security.html" rel="nofollow">safelite</a>. It's also not that hard to <a href="http://mail.python.org/pipermail/python-dev/2012-March/117339.html" rel="nofollow">cause CPython to crash</a>, which opens another path to be exploited from running arbitrary code. Avoiding resource exhaustion or CPU-use DoS from arbitrary code is probably impossible to do in-process (you'd need a watchdog, system limits, etc.).</p> <p>Something crucial for people wanting to have sandboxed code execution in Python is to avoid rolling your own (or simply modifying <code>sys</code>, <code>__builtins__</code>): it's very easy to convince yourself it's rock solid and yet miss some obvious workaround that bypasses your protection. Keep in mind Python used to include a module that offered this kind of protection and even that had glaring issues that allowed to escape its restrictions. IIRC, it was vulnerable to fishing non-restricted objects (via introspection) into the restricted environment.</p> <p>That said, <a href="https://github.com/haypo/pysandbox" rel="nofollow">pysandbox</a> is written by a core Python developer who believes it to be safe when restricting e.g. IO (and it incorporates a lot of previous research) and can run in-process like you want (albeit with a few less features, like DoS protections from CPU and memory use).</p>
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    1. CODoes Pysandbox have any sort of eval command? Currently it has `execute`, which is analogous to 'exec', but it does not seem to have anything similar to `eval`.
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