https://github.com/python/cpython/commit/9e8fa2d4d1ec263bdc6945237b0e0517f07a3474
commit: 9e8fa2d4d1ec263bdc6945237b0e0517f07a3474
branch: main
author: Serhiy Storchaka <[email protected]>
committer: serhiy-storchaka <[email protected]>
date: 2026-02-18T13:13:32+02:00
summary:
gh-144386: Update equivalent code for "with", "async with" and "async for"
(GH-144472)
They use special method lookup for special methods.
files:
M Doc/reference/compound_stmts.rst
diff --git a/Doc/reference/compound_stmts.rst b/Doc/reference/compound_stmts.rst
index 861c221502ed4d..0cf0a41bfb400c 100644
--- a/Doc/reference/compound_stmts.rst
+++ b/Doc/reference/compound_stmts.rst
@@ -544,9 +544,9 @@ 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:
@@ -554,11 +554,14 @@ is semantically equivalent to::
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::
@@ -1679,13 +1682,12 @@ 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:
@@ -1693,7 +1695,8 @@ Is semantically equivalent to::
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.
@@ -1719,9 +1722,9 @@ 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:
@@ -1729,13 +1732,14 @@ is semantically equivalent to::
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.
_______________________________________________
Python-checkins mailing list -- [email protected]
To unsubscribe send an email to [email protected]
https://mail.python.org/mailman3//lists/python-checkins.python.org
Member address: [email protected]
