Python 3.4 主要包括：
PEP 435, a standardized "enum" module
PEP 442, improved semantics for object finalization
PEP 443, adding single-dispatch generic functions to the standard library
PEP 445, a new C API for implementing custom memory allocators
PEP 446, changing file descriptors to not be inherited by default in subprocesses
免费下载：http://www.python.org/ftp/python/
来自:开源中国社区
