Author: guido.van.rossum
Date: Wed Dec 3 03:31:31 2008
New Revision: 67489

Log:
Another checkpoint.
(A bit of a mess, a previous submit apparently didn't go through.)


Modified:
python/branches/py3k/Doc/whatsnew/3.0.rst

Modified: python/branches/py3k/Doc/whatsnew/3.0.rst
==============================================================================
--- python/branches/py3k/Doc/whatsnew/3.0.rst (original)
+++ python/branches/py3k/Doc/whatsnew/3.0.rst Wed Dec 3 03:31:31 2008
@@ -19,7 +19,8 @@

* The maintainer will go through Misc/NEWS periodically and add
changes; it's therefore more important to add your changes to
- Misc/NEWS than to this file.
+ Misc/NEWS than to this file. (Note: I didn't get to this for 3.0.
+ GvR.)

* This is not a complete list of every single change; completeness
is the purpose of Misc/NEWS. Some changes I consider too small
@@ -40,7 +41,8 @@
necessary (especially when a final release is some months away).

* Credit the author of a patch or bugfix. Just the name is
- sufficient; the e-mail address isn't necessary.
+ sufficient; the e-mail address isn't necessary. (Due to time
+ constraints I haven't managed to do this for 3.0. GvR.)

* It's helpful to add the bug/patch number as a comment:

@@ -50,7 +52,8 @@
(Contributed by P.Y. Developer.)

This saves the maintainer the effort of going through the SVN log
- when researching a change.
+ when researching a change. (Again, I didn't get to this for 3.0.
+ GvR.)

This article explains the new features in Python 3.0, compared to 2.6.
Python 3.0, also known as "Python 3000" or "Py3K", is the first ever
@@ -157,20 +160,38 @@
always use an encoding to map between strings (in memory) and bytes
(on disk). Binary files (opened with a ``b`` in the mode argument)
always use bytes in memory. This means that if a file is opened
- using an incorrect mode or encoding, I/O will likely fail. There is
- a platform-dependent default encoding, which on Unixy platforms can
- be set with the ``LANG`` environment variable (and sometimes also
- with some other platform-specific locale-related environment
- variables). In many cases, but not all, the system default is
- UTF-8; you should never count on this default. Any application
- reading or writing more than pure ASCII text should probably have a
- way to override the encoding.
+ using an incorrect mode or encoding, I/O will likely fail. It also
+ means that even Unix users will have to specify the correct mode
+ (text or binary) when opening a file. There is a platform-dependent
+ default encoding, which on Unixy platforms can be set with the
+ ``LANG`` environment variable (and sometimes also with some other
+ platform-specific locale-related environment variables). In many
+ cases, but not all, the system default is UTF-8; you should never
+ count on this default. Any application reading or writing more than
+ pure ASCII text should probably have a way to override the encoding.

* The builtin :class:`basestring` abstract type was removed. Use
:class:`str` instead. The :class:`str` and :class:`bytes` types
don't have functionality enough in common to warrant a shared base
class.

+* Filenames are passed to and returned from APIs as (Unicode) strings.
+ This can present platform-specific problems because on some
+ platforms filenames are arbitrary byte strings. (On the other hand
+ on Windows, filenames are natively stored as Unicode.) As a
+ work-around, most APIs (e.g. :func:`open` and many functions in the
+ :mod:`os` module) that take filenames accept :class:`bytes` objects
+ as well as strings, and a few APIs have a way to ask for a
+ :class:`bytes` return value: :func:`os.listdir` returns a
+ :class:`bytes` instance if the argument is a :class:`bytes`
+ instance, and :func:`os.getcwdu` returns the current working
+ directory as a :class:`bytes` instance.
+
+* Some system APIs like :data:`os.environ` and :data:`sys.argv` can
+ also present problems when the bytes made available by the system is
+ not interpretable using the default encoding. Setting the ``LANG``
+ variable and rerunning the program is probably the best approach.
+
* All backslashes in raw strings are interpreted literally. This
means that ``'\U'`` and ``'\u'`` escapes in raw strings are not
treated specially.
@@ -439,7 +460,7 @@
start deprecating the ``%`` operator in Python 3.1.

* :ref:`pep-3105`. This is now a standard feature and no longer needs
- to be imported from :mod:`__future__`.
+ to be imported from :mod:`__future__`. More details were given above.

* :ref:`pep-3110`. The :keyword:`except` *exc* :keyword:`as` *var*
syntax is now standard and :keyword:`except` *exc*, *var* is no

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