Closed
Description
I think this is a regression. The following script produces an unexpected result in MicroPython:
try:
import uasyncio as asyncio
except ImportError:
import asyncio
async def will_stop(n):
print('Runs to completion')
for _ in range(6):
await asyncio.sleep(1)
return 2 * n
async def forever(n):
print('forever() will be cancelled')
while True:
await asyncio.sleep(1)
n += 1
return n
async def do_cancel(task):
await asyncio.sleep(3)
print('About to cancel forever')
task.cancel()
async def main():
tasks = [asyncio.create_task(forever(70))]
tasks.append(will_stop(21))
asyncio.create_task(do_cancel(tasks[0]))
res = None
try:
res = await asyncio.gather(*tasks, return_exceptions=True)
except asyncio.CancelledError:
print('Cancelled')
print('Result: ', res)
asyncio.run(main())CPython (expected behaviour):
adminpete@debian8:/mnt/qnap2/temp$ python3
Python 3.8.0 (default, Dec 6 2019, 16:20:13)
[GCC 4.9.2] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import rats40
forever() will be cancelled
Runs to completion
About to cancel forever
Result: [CancelledError(), 42]
>>>
MicroPython (behaves as if return_exceptions==False):
MicroPython v1.17 on 2021-09-02; linux version
Use Ctrl-D to exit, Ctrl-E for paste mode
>>> import rats40
forever() will be cancelled
Runs to completion
About to cancel forever
Cancelled
Result: None
>>>