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PyPy
The PyPy project aims at producing a flexible and fast Python implementation. The guiding idea is to translate a Python-level description of the Python language itself to lower level languages.
PyPy is an implementation of the Python programming language written in Python itself, flexible and easy to experiment with. The long-term goals are to target a large variety of platforms, small and large, by providing a compiler toolsuite that can produce custom Python versions.
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