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Merged revisions 74792,74810 via svnmerge from
svn+ssh://svn.python.org/python/branches/py3k ................ r74792 | georg.brandl | 2009-09-14 16:49:30 +0200 (Mo, 14 Sep 2009) | 9 lines Recorded merge of revisions 74791 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r74791 | georg.brandl | 2009-09-14 16:08:54 +0200 (Mo, 14 Sep 2009) | 1 line #6574: list the future features in a table. ........ ................ r74810 | georg.brandl | 2009-09-15 21:55:15 +0200 (Di, 15 Sep 2009) | 1 line Do not document the most important (at least for Guido) future import. ................
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@ -10,9 +10,9 @@
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* To avoid confusing existing tools that analyze import statements and expect to
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find the modules they're importing.
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* To ensure that future_statements run under releases prior to 2.1 at least
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yield runtime exceptions (the import of :mod:`__future__` will fail, because
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there was no module of that name prior to 2.1).
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* To ensure that :ref:`future statements <future>` run under releases prior to
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2.1 at least yield runtime exceptions (the import of :mod:`__future__` will
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fail, because there was no module of that name prior to 2.1).
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* To document when incompatible changes were introduced, and when they will be
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--- or were --- made mandatory. This is a form of executable documentation, and
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@ -56,7 +56,35 @@ argument to the built-in function :func:`compile` to enable the feature in
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dynamically compiled code. This flag is stored in the :attr:`compiler_flag`
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attribute on :class:`_Feature` instances.
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No feature description will ever be deleted from :mod:`__future__`.
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No feature description will ever be deleted from :mod:`__future__`. Since its
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introduction in Python 2.1 the following features have found their way into the
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language using this mechanism:
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+------------------+-------------+--------------+---------------------------------------------+
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| feature | optional in | mandatory in | effect |
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+==================+=============+==============+=============================================+
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| nested_scopes | 2.1.0b1 | 2.2 | :pep:`227`: |
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| | | | *Statically Nested Scopes* |
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+------------------+-------------+--------------+---------------------------------------------+
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| generators | 2.2.0a1 | 2.3 | :pep:`255`: |
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| | | | *Simple Generators* |
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+------------------+-------------+--------------+---------------------------------------------+
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| division | 2.2.0a2 | 3.0 | :pep:`238`: |
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| | | | *Changing the Division Operator* |
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+------------------+-------------+--------------+---------------------------------------------+
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| absolute_import | 2.5.0a1 | 2.7 | :pep:`328`: |
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| | | | *Imports: Multi-Line and Absolute/Relative* |
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+------------------+-------------+--------------+---------------------------------------------+
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| with_statement | 2.5.0a1 | 2.6 | :pep:`343`: |
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| | | | *The "with" Statement* |
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+------------------+-------------+--------------+---------------------------------------------+
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| print_function | 2.6.0a2 | 3.0 | :pep:`3105`: |
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| | | | *Make print a function* |
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+------------------+-------------+--------------+---------------------------------------------+
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| unicode_literals | 2.6.0a2 | 3.0 | :pep:`3112`: |
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| | | | *Bytes literals in Python 3000* |
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+------------------+-------------+--------------+---------------------------------------------+
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.. seealso::
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