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Improve the porting section

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Antoine Pitrou 2011-10-24 00:25:41 +02:00
parent fd9b4166bb
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1 changed files with 24 additions and 6 deletions
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Doc/whatsnew/3.3.rst
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@ -49,6 +49,8 @@
This article explains the new features in Python 3.3, compared to 3.2.
.. _pep-393:
PEP 393: Flexible String Representation
=======================================
@ -540,7 +542,10 @@ Porting to Python 3.3
=====================
This section lists previously described changes and other bugfixes
that may require changes to your code:
that may require changes to your code.
Porting Python code
-------------------
* Issue #12326: On Linux, sys.platform doesn't contain the major version
anymore. It is now always 'linux', instead of 'linux2' or 'linux3' depending
@ -548,6 +553,24 @@ that may require changes to your code:
with sys.platform.startswith('linux'), or directly sys.platform == 'linux' if
you don't need to support older Python versions.
Porting C code
--------------
* Due to :ref:`PEP 393 <pep-393>`, the :c:type:`Py_UNICODE` type and all
functions using this type are deprecated (but will stay available for
at least five years). If you were using low-level Unicode APIs to
construct and access unicode objects and you want to benefit of the
memory footprint reduction provided by the PEP 393, you have to convert
your code to the new :doc:`Unicode API <../c-api/unicode>`.
However, if you only have been using high-level functions such as
:c:func:`PyUnicode_Concat()`, :c:func:`PyUnicode_Join` or
:c:func:`PyUnicode_FromFormat()`, your code will automatically take
advantage of the new unicode representations.
Other issues
------------
.. Issue #11591: When :program:`python` was started with :option:`-S`,
``import site`` will not add site-specific paths to the module search
paths. In previous versions, it did. See changeset for doc changes in
@ -557,8 +580,3 @@ that may require changes to your code:
removed. Code checking sys.flags.division_warning will need updating.
Contributed by Éric Araujo.
* :pep:`393`: The :c:type:`Py_UNICODE` type and all functions using this type
are deprecated. To fully benefit of the memory footprint reduction provided
by the PEP 393, you have to convert your code to the new Unicode API. Read
the porting guide: XXX.