PyPy

PyPy是一个Python语言开发的Python实现。因此，Python程序员可以直接使用Python语言本身，而不是C来改变底层Python实现的行为。（听上去像是一段绕口令)。

Quote from 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.
Rumors have it that the secret goal is being faster-than-C which is
nonsense, isn't it?