[pull] main from python:main

Lib/asyncio/base_subprocess.py

@@ -104,7 +104,12 @@ def close(self):
         for proto in self._pipes.values():
             if proto is None:
                 continue
-            proto.pipe.close()
+            # See gh-114177
+            # skip closing the pipe if loop is already closed
+            # this can happen e.g. when loop is closed immediately after
+            # process is killed
+            if self._loop and not self._loop.is_closed():
+                proto.pipe.close()
 
         if (self._proc is not None and
                 # has the child process finished?

Lib/asyncio/tools.py

@@ -13,11 +13,17 @@ class NodeType(Enum):
     TASK = 2
 
 
-@dataclass(frozen=True)
 class CycleFoundException(Exception):
     """Raised when there is a cycle when drawing the call tree."""
-    cycles: list[list[int]]
-    id2name: dict[int, str]
+    def __init__(
+            self,
+            cycles: list[list[int]],
+            id2name: dict[int, str],
+        ) -> None:
+        super().__init__(cycles, id2name)
+        self.cycles = cycles
+        self.id2name = id2name
+
 
 
 # ─── indexing helpers ───────────────────────────────────────────

Lib/types.py

@@ -250,7 +250,6 @@ def deleter(self, fdel):
 
 
 class _GeneratorWrapper:
-    # TODO: Implement this in C.
     def __init__(self, gen):
         self.__wrapped = gen
         self.__isgen = gen.__class__ is GeneratorType
@@ -305,7 +304,6 @@ def coroutine(func):
         # Check if 'func' is a generator function.
         # (0x20 == CO_GENERATOR)
         if co_flags & 0x20:
-            # TODO: Implement this in C.
             co = func.__code__
             # 0x100 == CO_ITERABLE_COROUTINE
             func.__code__ = co.replace(co_flags=co.co_flags | 0x100)

Misc/NEWS.d/next/Library/2025-05-22-13-10-32.gh-issue-114177.3TYUJ3.rst

@@ -0,0 +1 @@
+Fix :mod:`asyncio` to not close subprocess pipes which would otherwise error out when the event loop is already closed.

Misc/NEWS.d/next/Library/2025-05-22-14-12-53.gh-issue-134451.M1rD-j.rst

@@ -0,0 +1 @@
+Converted ``asyncio.tools.CycleFoundException`` from dataclass to a regular exception type.