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  r74791 | georg.brandl | 2009-09-14 16:08:54 +0200 (Mo, 14 Sep 2009) | 1 line

  #6574: list the future features in a table.
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Georg Brandl 2009-09-14 14:49:30 +00:00
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Doc/library/__future__.rst
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@ -10,9 +10,9 @@
* To avoid confusing existing tools that analyze import statements and expect to * To avoid confusing existing tools that analyze import statements and expect to
find the modules they're importing. find the modules they're importing.
* To ensure that future_statements run under releases prior to 2.1 at least * To ensure that :ref:`future statements <future>` run under releases prior to
yield runtime exceptions (the import of :mod:`__future__` will fail, because 2.1 at least yield runtime exceptions (the import of :mod:`__future__` will
there was no module of that name prior to 2.1). fail, because there was no module of that name prior to 2.1).
* To document when incompatible changes were introduced, and when they will be * To document when incompatible changes were introduced, and when they will be
--- or were --- made mandatory. This is a form of executable documentation, and --- or were --- made mandatory. This is a form of executable documentation, and
@ -56,7 +56,37 @@ argument to the built-in function :func:`compile` to enable the feature in
dynamically compiled code. This flag is stored in the :attr:`compiler_flag` dynamically compiled code. This flag is stored in the :attr:`compiler_flag`
attribute on :class:`_Feature` instances. attribute on :class:`_Feature` instances.
No feature description will ever be deleted from :mod:`__future__`. No feature description will ever be deleted from :mod:`__future__`. Since its
introduction in Python 2.1 the following features have found their way into the
language using this mechanism:
+------------------+-------------+--------------+---------------------------------------------+
| feature | optional in | mandatory in | effect |
+==================+=============+==============+=============================================+
| nested_scopes | 2.1.0b1 | 2.2 | :pep:`227`: |
| | | | *Statically Nested Scopes* |
+------------------+-------------+--------------+---------------------------------------------+
| generators | 2.2.0a1 | 2.3 | :pep:`255`: |
| | | | *Simple Generators* |
+------------------+-------------+--------------+---------------------------------------------+
| division | 2.2.0a2 | 3.0 | :pep:`238`: |
| | | | *Changing the Division Operator* |
+------------------+-------------+--------------+---------------------------------------------+
| absolute_import | 2.5.0a1 | 2.7 | :pep:`328`: |
| | | | *Imports: Multi-Line and Absolute/Relative* |
+------------------+-------------+--------------+---------------------------------------------+
| with_statement | 2.5.0a1 | 2.6 | :pep:`343`: |
| | | | *The "with" Statement* |
+------------------+-------------+--------------+---------------------------------------------+
| print_function | 2.6.0a2 | 3.0 | :pep:`3105`: |
| | | | *Make print a function* |
+------------------+-------------+--------------+---------------------------------------------+
| unicode_literals | 2.6.0a2 | 3.0 | :pep:`3112`: |
| | | | *Bytes literals in Python 3000* |
+------------------+-------------+--------------+---------------------------------------------+
| barry_as_FLUFL | 3.1.0a1 | 3.9 | :pep:`401`: |
| | | | *BDFL Retirement* |
+------------------+-------------+--------------+---------------------------------------------+
.. seealso:: .. seealso::