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[3.13] gh-144386: Update equivalent code for "with", "async with" and "async for" (GH-144472) by miss-islington · Pull Request #144946 · python/cpython · GitHub

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[3.13] gh-144386: Update equivalent code for "with", "async with" and "async for" (GH-144472) #144946

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Merged
serhiy-storchaka merged 1 commit into from
Feb 18, 2026
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[3.13] gh-144386: Update equivalent code for "with", "async with" and "async for" (GH-144472) #144946

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34 changes: 19 additions & 15 deletions Doc/reference/compound_stmts.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -537,21 +537,24 @@ The following code::
is semantically equivalent to::

manager = (EXPRESSION)
enter = type(manager).__enter__
exit = type(manager).__exit__
value = enter(manager)
enter = manager.__enter__
exit = manager.__exit__
value = enter()
hit_except = False

try:
TARGET = value
SUITE
except:
hit_except = True
if not exit(manager, *sys.exc_info()):
if not exit(*sys.exc_info()):
raise
finally:
if not hit_except:
exit(manager, None, None, None)
exit(None, None, None)

except that implicit :ref:`special method lookup <special-lookup>` is used
for :meth:`~object.__enter__` and :meth:`~object.__exit__`.

With more than one item, the context managers are processed as if multiple
:keyword:`with` statements were nested::
Expand Down Expand Up @@ -1562,21 +1565,21 @@ The following code::

Is semantically equivalent to::

iter = (ITER)
iter = type(iter).__aiter__(iter)
iter = (ITER).__aiter__()
running = True

while running:
try:
TARGET = await type(iter).__anext__(iter)
TARGET = await iter.__anext__()
except StopAsyncIteration:
running = False
else:
SUITE
else:
SUITE2

See also :meth:`~object.__aiter__` and :meth:`~object.__anext__` for details.
except that implicit :ref:`special method lookup <special-lookup>` is used
for :meth:`~object.__aiter__` and :meth:`~object.__anext__`.

It is a :exc:`SyntaxError` to use an ``async for`` statement outside the
body of a coroutine function.
Expand All @@ -1602,23 +1605,24 @@ The following code::
is semantically equivalent to::

manager = (EXPRESSION)
aenter = type(manager).__aenter__
aexit = type(manager).__aexit__
value = await aenter(manager)
aenter = manager.__aenter__
aexit = manager.__aexit__
value = await aenter()
hit_except = False

try:
TARGET = value
SUITE
except:
hit_except = True
if not await aexit(manager, *sys.exc_info()):
if not await aexit(*sys.exc_info()):
raise
finally:
if not hit_except:
await aexit(manager, None, None, None)
await aexit(None, None, None)

See also :meth:`~object.__aenter__` and :meth:`~object.__aexit__` for details.
except that implicit :ref:`special method lookup <special-lookup>` is used
for :meth:`~object.__aenter__` and :meth:`~object.__aexit__`.

It is a :exc:`SyntaxError` to use an ``async with`` statement outside the
body of a coroutine function.
Expand Down
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