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下载:Python 2.6
下载:Python 3.0

http://www.python.org/download/releases/3.0/NEWS.txt

What's new in Python 3.0b1?
===========================

*Release date: 18-Jun-2008*

Core and Builtins
-----------------

- Issue #3100: Corrected a crash on deallocation of a subclassed weakref which
  holds the last (strong) reference to its referent.

- Issue #2630: implement PEP 3138. repr() now returns printable
  Unicode characters unescaped, to get an ASCII-only representation
  of an object use ascii().

- Issue #1342: On windows, Python could not start when installed in a
  directory with non-ascii characters.

- Implement PEP 3121: new module initialization and finalization API.

- Removed the already-defunct ``-t`` option.

- Issue #2957: Corrected a ValueError "recursion limit exceeded", when
  unmarshalling many code objects, which happens when importing a
  large .pyc file (~1000 functions).

- Issue #2963: fix merging oversight that disabled method cache for
  all types.

- Issue #2964: fix a missing INCREF in instancemethod_descr_get.

- Issue #2895: Don't crash when given bytes objects as keyword names.

- Issue #2798: When parsing arguments with PyArg_ParseTuple, the "s"
  code now allows any unicode string and returns a utf-8 encoded
  buffer, just like the "s#" code already does.  The "z" code was
  corrected as well.

- Issue #2863: generators now have a ``gen.__name__`` attribute that
  equals ``gen.gi_code.co_name``, like ``func.__name___`` that equals
  ``func.func_code.co_name``.  The repr() of a generator now also
  contains this name.

- Issue #2831: enumerate() now has a ``start`` argument.

- Issue #2801: fix bug in the float.is_integer method where a
  ValueError was sometimes incorrectly raised.

- The ``--with-toolbox-glue`` option (and the associated
  pymactoolbox.h) have been removed.

- Issue #2196: hasattr() now lets exceptions which do not inherit
  Exception (KeyboardInterrupt, and SystemExit) propagate instead of
  ignoring them.

- #3021 Exception reraising sematics have been significantly improved.  However,
  f_exc_type, f_exc_value, and f_exc_traceback cannot be accessed from Python
  code anymore.

- Three of PyNumberMethods' members, nb_coerce, nb_hex, and nb_oct, have been
  removed.