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bpo-31708: Allow async generator expressions in synchronous functions (#3905)

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Yury Selivanov 2017-10-06 02:58:28 -04:00 • committed by GitHub
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Doc/reference/expressions.rst
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@ -326,14 +326,16 @@ range(10) for y in bar(x))``.
The parentheses can be omitted on calls with only one argument. See section
:ref:`calls` for details.
Since Python 3.6, if the generator appears in an :keyword:`async def` function,
then :keyword:`async for` clauses and :keyword:`await` expressions are permitted
as with an asynchronous comprehension. If a generator expression
contains either :keyword:`async for` clauses or :keyword:`await` expressions
it is called an :dfn:`asynchronous generator expression`.
An asynchronous generator expression yields a new asynchronous
generator object, which is an asynchronous iterator
(see :ref:`async-iterators`).
If a generator expression contains either :keyword:`async for`
clauses or :keyword:`await` expressions it is called an
:dfn:`asynchronous generator expression`. An asynchronous generator
expression returns a new asynchronous generator object,
which is an asynchronous iterator (see :ref:`async-iterators`).
.. versionchanged:: 3.7
Prior to Python 3.7, asynchronous generator expressions could
only appear in :keyword:`async def` coroutines. Starting
with 3.7, any function can use asynchronous generator expressions.
.. _yieldexpr: