Cant run asyncio.run() from within the IDE

[Nic-Roberts-Hud]

Win 11 x64, Python 3.12, Spyder 5.5.1

I'm trying to run the device discovery code from the bleak Bluetooth library

import asyncio
from bleak import BleakScanner

async def main():
    devices = await BleakScanner.discover()
    for d in devices:
        print(d)

asyncio.run(main())

but keep getting the following error,

asyncio.run() cannot be called from a running event loop

Full traceback,

Traceback (most recent call last):

  File ~\.conda\envs\BLE\Lib\site-packages\spyder_kernels\py3compat.py:356 in compat_exec
    exec(code, globals, locals)

  File c:\users\sengnr3\.spyder-py3\temp.py:18
    asyncio.run(main())

  File ~\.conda\envs\BLE\Lib\asyncio\runners.py:190 in run
    raise RuntimeError(

RuntimeError: asyncio.run() cannot be called from a running event loop

The code runs as expected when called from the command line.

[dalthviz]

Hi @Nic-Roberts-Hud thank you for the report! I think if you are running IPython >=7 you should be able to run your code changing it to be something like:

from bleak import BleakScanner

async def main():
    devices = await BleakScanner.discover()
    for d in devices:
        print(d)

await main()

Did a quick check using Spyder 6.0.3 on Windows from our installer (which comes with IPython 8.30.0) and I'm able to run the following:

async def main():
    print("d")

await main()

For more info you can check https://stackoverflow.com/a/55409674/15954282

Let us know if the info above helps!