pypy -- 用python实现的python

pypy 分为两部分：一个 python 的实现 和 一个编译器：

pypy provides infrastructure for building interpreters in [r]python. This infrastructure makes it much easier than starting from scratch, e.g. by providing reusable components for language runtimes (like GC's).

http://codespeak.net/svn/user/antocuni/eos-due-2007/rpython.pdf

Trying out PyPy

http://codespeak.net/pypy/dist/pypy/doc/cli-backend.html

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CPython 和IronPython的基准测试