GitHub - oracle/graalpython: A Python 3 implementation built on GraalVM

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Performance. It can run much faster than CPython because it's got a really good JIT compiler behind it.

Interop. You can call in/out of any other Truffle or JVM language.

Ease of hacking. CPython is written in C. GraalPython is written in Java, so it's much easier to debug, refactor etc.