John Belmonte <j...@neggie.net> added the comment:
demonstrating the difference for async case:
import contextlib
import trio
async def background():
assert False
async def main1():
async with trio.open_nursery() as nursery:
nursery.start_soon(background)
await trio.sleep_forever()
async def main2():
async with contextlib.AsyncExitStack() as stack:
nursery = await stack.enter_async_context(trio.open_nursery())
nursery.start_soon(background)
await trio.sleep_forever()
try:
trio.run(main1)
except BaseException as e:
print('main1, context:', e.__context__)
try:
trio.run(main2)
except BaseException as e:
print('main2, context:', e.__context__)
----
main1, context: None
main2, context: Cancelled
----------
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue44594>
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