Python 3.4.0 發(fā)布，此版本包括一系列 3.x 系列的改進，數(shù)百個小的改進和 bug 修復(fù)。

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值得注意的更新內(nèi)容如下：

新語法特性:

• Python 3.4 并未添加任何新的語法特性

其他新特性:

• pip should always be available (PEP 453).

• Newly created file descriptors are non-inheritable(PEP 446).

• command line option for isolated mode(issue 16499).

• improvements in the handling of codecsthat are not text encodings (multiple issues).

• A ModuleSpec Type for the Import System (PEP 451).  (Affects importer authors.)

• The marshal format has been made more compact and efficient (issue 16475).

新的庫模塊:

• asyncio: New provisional API for asynchronous IO (PEP 3156).

• ensurepip: Bootstrapping the pip installer(PEP 453).

• enum: Support for enumeration types(PEP 435).

• pathlib: Object-oriented filesystem paths(PEP 428).

• selectors: High-level and efficient I/O multiplexing, built upon the select module primitives (part of PEP 3156).

• statistics: A basic numerically stable statistics library (PEP 450).

• tracemalloc: Trace Python memory allocations (PEP 454).

庫模塊中重大的改進:

• Single-dispatch generic functions infunctools (PEP 443).

• New pickle protocol 4 (PEP 3154).

• multiprocessing now has an option to avoid using os.fork on Unix (issue 8713).

• email has a new submodule, contentmanager, and a new Message subclass (EmailMessage) that simplify MIME handling (issue 18891).

• The inspect and pydoc modules are now capable of correct introspection of a much wider variety of callable objects, which improves the output of the Python help() system.

• The ipaddress module API has been declared stable

安全改進:

• Secure and interchangeable hash algorithm(PEP 456).

• Make newly created file descriptors non-inheritable(PEP 446) to avoid leaking file descriptors to child processes.

• New command line option for isolated mode, (issue 16499).

• multiprocessing now has an option to avoid using os.fork on Unix.  spawn and forkserver are more secure because they avoid sharing data with child processes.

• multiprocessing child processes on Windows no longer inherit all of the parent’s inheritable handles, only the necessary ones.

• A new hashlib.pbkdf2_hmac() function provides the PKCS#5 password-based key derivation function 2.

• TLSv1.1 and TLSv1.2 support for ssl.

• Retrieving certificates from the Windows system cert store support for ssl.

• Server-side SNI (Server Name Indication) support for ssl.

• The ssl.SSLContext class has a lot of improvements.

• All modules in the standard library that support SSL now support server certificate verification, including hostname matching (ssl.match_hostname()) and CRLs (Certificate Revocation lists, seessl.SSLContext.load_verify_locations()).

CPython 實現(xiàn)改進:

• Safe object finalization (PEP 442).

• Leveraging PEP 442, in most cases module globals are no longer set to None during finalization (issue 18214).

• Configurable memory allocators (PEP 445).

• Argument Clinic (PEP 436).

其他的還包括許多 CPython 的優(yōu)化，用法和潛在移植問題，更多內(nèi)容請看發(fā)行說明，新特性介紹或者是更新日志，可以在這里下載最新版本。

下載地址：http://legacy.python.org/ftp//python/

本文標題：Python3.4.0正式版發(fā)布
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