Python 3.5.5rc1 和 Python 3.4.8rc1 发布了。主要更新内容如下： Python 3.5.5rc1 PEP 441, improved Python zip application support PEP 448, additional unpacking generalizations PEP 461, "%-formatting" for bytes and bytearray objects PEP 465, a new operator (@) for matrix multiplication PEP 471, os.scandir(), a fast new directory traversal function PEP 475, adding support for automatic retries of interrupted system calls PEP 479, change StopIteration handling inside generators PEP 484, the typing module, a new standard for type annotations PEP 485, math.isclose(), a function for testing approximate equality PEP 486, making the Windows Python launcher aware of virtual environments PEP 488, eliminating .pyo files PEP 489, a new and improved mechanism for loading extension modules PEP 492, coroutines with async and await syntax Python 3.4.8rc1 PEP 428, a "pathlib" module providing object-oriented filesystem paths PEP 435, a standardized "enum" module PEP 436, a build enhancement that will help generate introspection information for builtins 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 PEP 450, a new "statistics" module PEP 451, standardizing module metadata for Python's module import system PEP 453, a bundled installer for the pip package manager PEP 454, a new "tracemalloc" module for tracing Python memory allocations PEP 456, a new hash algorithm for Python strings and binary data PEP 3154, a new and improved protocol for pickled objects PEP 3156, a new "asyncio" module, a new framework for asynchronous I/O 详情及下载地址： Python 3.5.5rc1 Python 3.4.8rc1 Python 3.5.5rc1 和 Python 3.4.8rc1 发布下载地址
