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Another checkpoint to switch machines.

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Guido van Rossum 2008-12-02 17:31:14 +00:00
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@ -333,10 +333,72 @@ Changes Already Present In Python 2.6
This section reminds the reader of new features that were originally
designed for Python 3.0 but that were already introduced in Python
2.6. The descriptions in "What's New in Python 2.6" are hereby
included by reference.
2.6. The descriptions in "What's New in Python 2.6" should be
consulted for longer descriptions.
XXX How to cross-link?
* PEP 343: The :keyword:`with` statement is now a standard feature and
no longer needs to be imported from the ``__future__``.
* PEP 366: Explicit relative imports from a main module inside a package.
This enhances the usefulness of the :option:`-m` option.
* PEP 370: Per-user ``site-packages`` directory.
* PEP 371: The ``multiprocessing`` package. XXX Did anything change here?
* PEP 3101: Advanced string formatting. Note: the 2.6 description
mentions the :method:`format` method for both 8-bit and Unicode
strings. In 3.0, only the :class:`str` type (text strings with
Unicode support) supports this method; the :class:`bytes` type does
not.
* PEP 3105: Print as a function. This is now a standard feature and
no longer needs to be imported from the ``__future__``.
* PEP 3110: Exception-handling changes. The ``except exc as var:``
syntax is now standard and ``except exc, var:`` is no longer supported.
(Of course, the ``as var`` part is still optional.)
* PEP 3112: Byte literals. The ``b"..."`` string literal notation
(and its variants like ``b'...'``, ``b"""...""", and ``br'...`'')
now produces a literal of type :class:`bytes`. More about :class:`bytes`
below.
* PEP 3116: New I/O library. The :module:`io` module is now the
standard way of doing file I/O, and the initial values of
``sys.stdin``, ``sys.stdout`` and ``sys.stderr`` are now instances
of :class:`io.TextIOBase`. The builtin :func:`open` function is
now an alias for ``io.open`` and has additional keyword arguments:
``encoding``, ``errors``, ``newline`` and ``closefd``.
* PEP 3118: Revised buffer protocol. The old builtin
:function:`buffer` is no more; the new builtin
:function:`memoryview` provides (mostly) similar functionality.
* PEP 3119: Abstract Base Classes (ABCs). These play a slightly more
prominent role in the language now, and builtin collection types like
:class:`dict` and :class:`list` conform to the :class:`Mapping` and
:class:`Sequence` protocol, correspondingly.
* PEP 3127: Integer literal suport and syntax. As mentioned above,
the new octal literal notation is the only one supported, and binary
literals have been added.
* PEP 3129: Class decorators. This speaks for itself.
* PEP 3141: A type hierarchy for numbers. This is another new use of
ABCs, defining Python's "numeric tower".
* XXX More.
Library Changes
===============
XXX Brief overview of what's changed in the library.
* XXX List each of those briefly.
Strings And Bytes
=================