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Description
TaskGroup suppresses grouped exceptions due to parent task cancellation
The suggestion was to always check for Cancellation in every finally block in async context managers, however sometimes there's no finally block visible and the problem applies to synchronous context managers too
In this demo I'd expect to be able to print: "handled attribute error"
importasyncioimportcontextlibasyncdefchild(sock):try:withcontextlib.closing(sock):awaitasyncio.sleep(2)exceptExceptionase:print(f"child task got error:{type(e)=}{e=}")raiseclassSock:asyncdefaclose(self):awaitasyncio.sleep(1)asyncdefmain():try:sock=Sock()asyncwithasyncio.timeout(1):asyncwithasyncio.TaskGroup()astg:# Make two concurrent calls to child()tg.create_task(child(Sock()))tg.create_task(child(Sock()))asyncwithcontextlib.aclosing(sock):awaitasyncio.sleep(2) except*AttributeError:print("handled attribute error")asyncio.run(main())