sandboxed PyPy interpreter

 A version of PyPy that runs fully "virtualized", where an external process
 controls all input/output. This is a secure sandbox, it is safe to run any
 untrusted Python code with it. The Python code cannot see or modify any local
 file except via interaction with the external process.
 .
 PyPy is a fast, compliant alternative implementation of the Python language
 (2.7).