When we say they are built-in functions we really only mean that
they do not need to be imported. If the documentation says something
is implemented in C, it's probably poor editing on our part: it is
mostly just a copy of the CPython documentation and things slip
through. The built-in functions are implemented in Java, so if you
are satisfied that you have locked down the JVM, you are probably
ok. However, I'm not in a position to advise you about securing the
Hallo friends of Python!
working on a Java project that allows to execute (untrusted)
Python user code. I've prevented the availablity of specific
Java classes/methods via a custom classloader. But I saw
that Jython also provides some native built-in functions
that are no Java code:
Outside the JVM itself, very little platform-native code is used.
One exception I know of is the jline library (console i/o) which
supplies native methods a dynamic library.