New submission from Michael Yoo <mich...@yoo.id.au>:
Version: Python 3.7.3
When I run this code:
import asyncio
class TestAsyncGenerator:
def __init__(self):
pass
async def aiter(self):
yield 1
yield 2
async def main():
gen = TestAsyncGenerator()
async for number in gen.aiter():
break
asyncio.run(main())
# unhandled exception during asyncio.run() shutdown
# task: <Task finished coro=<<async_generator_athrow without __name__>()>
exception=RuntimeError("can't send non-None value to a just-started coroutine")>
# RuntimeError: can't send non-None value to a just-started coroutine
There is a warning message that I don't expect to see. I would expect breaking
from an async iteration to behave as if breaking from a normal iteration - that
is, no problems.
However, I see the warning message shown above. Am I missing something?
Otherwise, I believe this is a bug. Thanks!
----------
components: asyncio
messages: 351044
nosy: Michael Yoo, asvetlov, yselivanov
priority: normal
severity: normal
status: open
title: AsyncGenerator breaks when not iterated fully with RuntimeError("can't
send non-None value to a just-started coroutine")
type: behavior
versions: Python 3.7
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue38013>
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