PyPy 2.3.1 发布了，主要改进包括：
The built-in struct module was renamed to _struct, solving issues with IDLE and other modules
Support for compilation with gcc-4.9
A CFFI-based version of the gdbm module is now included in our binary bundle
Many issues were resolved since the 2.3 release on May 8
完整的改进记录请看发行说明。
PyPy 是用Python实现的Python解释器。
PyPy是，Python开发者为了更好的Hack Python创建的项目。此外，PyPy比CPython是更加灵活，易于使用和试验，以制定具体的功能在不同情况的实现方法，可以很容易实施。 该项目的目标是，让PyPy比C实现的Python更为容易的适应各个项目和方便裁剪。
