[RELEASED] Python 3.3.0 release candidate 1

Discussion in 'Python' started by Georg Brandl, Aug 25, 2012.

  1. Georg Brandl

    Georg Brandl Guest

    On behalf of the Python development team, I'm delighted to announce the
    first release candidate of Python 3.3.0.

    This is a preview release, and its use is not recommended in
    production settings.

    Python 3.3 includes a range of improvements of the 3.x series, as well
    as easier porting between 2.x and 3.x. Major new features and changes
    in the 3.3 release series are:

    * PEP 380, syntax for delegating to a subgenerator ("yield from")
    * PEP 393, flexible string representation (doing away with the
    distinction between "wide" and "narrow" Unicode builds)
    * A C implementation of the "decimal" module, with up to 80x speedup
    for decimal-heavy applications
    * The import system (__import__) now based on importlib by default
    * The new "lzma" module with LZMA/XZ support
    * PEP 397, a Python launcher for Windows
    * PEP 405, virtual environment support in core
    * PEP 420, namespace package support
    * PEP 3151, reworking the OS and IO exception hierarchy
    * PEP 3155, qualified name for classes and functions
    * PEP 409, suppressing exception context
    * PEP 414, explicit Unicode literals to help with porting
    * PEP 418, extended platform-independent clocks in the "time" module
    * PEP 412, a new key-sharing dictionary implementation that
    significantly saves memory for object-oriented code
    * PEP 362, the function-signature object
    * The new "faulthandler" module that helps diagnosing crashes
    * The new "unittest.mock" module
    * The new "ipaddress" module
    * The "sys.implementation" attribute
    * A policy framework for the email package, with a provisional (see
    PEP 411) policy that adds much improved unicode support for email
    header parsing
    * A "collections.ChainMap" class for linking mappings to a single unit
    * Wrappers for many more POSIX functions in the "os" and "signal"
    modules, as well as other useful functions such as "sendfile()"
    * Hash randomization, introduced in earlier bugfix releases, is now
    switched on by default

    In total, almost 500 API items are new or improved in Python 3.3.
    For a more extensive list of changes in 3.3.0, see


    To download Python 3.3.0 visit:


    Please consider trying Python 3.3.0 with your code and reporting any bugs
    you may notice to:



    Georg Brandl, Release Manager
    georg at python.org
    (on behalf of the entire python-dev team and 3.3's contributors)
    Georg Brandl, Aug 25, 2012
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