From Rosetta Code
PyPy is an implementation of Python. Other implementations of Python.

A compliant implementation of the Python language written in a restricted subset of Python which can be run in another Python interpreter or translated to C and compiled for fast execution.

PyPy's Mission Statement is to provide:

  • a common translation and support framework for producing implementations of dynamic languages, emphasising a clean separation between language specification and implementation aspects.
  • a compliant, flexible and fast implementation of the Python Language using the above framework to enable new advanced features without having to encode low level details into it.[1]

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