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bpo-33514: Document PEP 492 changes in 3.7 changelog #6857

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2 changes: 2 additions & 0 deletions Doc/reference/compound_stmts.rst
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Expand Up @@ -684,6 +684,8 @@ can be used to create instance variables with different implementation details.
:pep:`3129` - Class Decorators


.. _async:

Coroutines
==========

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10 changes: 10 additions & 0 deletions Doc/whatsnew/3.7.rst
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Expand Up @@ -1157,6 +1157,16 @@ Changes in Python behavior
exceptions.
(Contributed by Yury Selivanov in :issue:`32670`.)

* :pep:`492` is fully implemented in Python 3.7, meaning that the old
:meth:`__aiter__` protocol is no longer supported: a
:exc:`RuntimeError` will be raised if :meth:`__aiter__` returns anything
but an asynchronous iterator.

Since Python 3.7, :keyword:`async` and :keyword:`await` names are proper
keywords. If you use them for variable names, you need to rename them in
order to make the code work on Python 3.7. Trying to use a keyword as
a variable name will raise a :exc:`SyntaxError`.

* Due to an oversight, earlier Python versions erroneously accepted the
following syntax::

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