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bpo-38605: Update "Future statements" docs since PEP 563 is always enabled (GH-25236) 

Update documentation section for "Future statements" to reflect that `from __future__ import annotations` is on by default, and no features require using the future statement now.
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Saiyang Gou 2021-04-06 22:02:20 -07:00 committed by GitHub
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Doc/reference/simple_stmts.rst
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@ -874,14 +874,11 @@ can appear before a future statement are:
* blank lines, and
* other future statements.
The only feature that requires using the future statement is
``annotations`` (see :pep:`563`).
All historical features enabled by the future statement are still recognized
by Python 3. The list includes ``absolute_import``, ``division``,
``generators``, ``generator_stop``, ``unicode_literals``,
``print_function``, ``nested_scopes`` and ``with_statement``. They are
all redundant because they are always enabled, and only kept for
``print_function``, ``nested_scopes``, ``with_statement`` and ``annotations``.
They are all redundant because they are always enabled, and only kept for
backwards compatibility.
A future statement is recognized and treated specially at compile time: Changes