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

[zhuzhangZZ]

Hello, I have use this package to try to control my SP-300, but when I run the test code, I have the errors as shown below,

Traceback (most recent call last):
  File ~\AppData\Local\Programs\Python\Python312\Lib\site-packages\spyder_kernels\py3compat.py:356 in compat_exec
    exec(code, globals, locals)
  File c:\modulationmicroscope\easy-biologic\tests\ocv.py:23
    prg.run()
  File c:\modulationmicroscope\easy-biologic\easy_biologic\base_programs.py:668 in run
    self._run( 'ocv', params, retrieve_data = retrieve_data )
  File c:\modulationmicroscope\easy-biologic\easy_biologic\program.py:514 in _run
    asyncio.run( self._retrieve_data( read_interval ) )

  File ~\AppData\Local\Programs\Python\Python312\Lib\asyncio\runners.py:190 in run
    raise RuntimeError(

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

import logging
import easy_biologic as ebl
import easy_biologic.base_programs as ebp
logging.basicConfig( level = logging.DEBUG )
channels = [ 0 ]
by_channel = False
params = { 
	'time': 10 
}
save_path = 'D:\\EC-lab_test' 
if not by_channel:
	# file if saving individually
	save_path += '.csv'
bl = ebl.BiologicDevice( 'USB0')
# bl.connect()
prg = ebp.OCV( device=bl, params = params, channels= channels)
prg.run()
prg.save_data( save_path, by_channel = by_channel )

I have also run the code below, I got the informations.
print(bl.info)
<easy_biologic.lib.ec_lib.DeviceInfo object at 0x000001BD452BF2D0>
print(bl.kind)
DeviceCodes.KBIO_DEV_SP300

And I have checked the firmware version is 11.4, and the technique files (.dll) version is "techniques-6.04", So I was wondering that do you have any idea about how to fix this problem? I have struggled in this problem for more than one day, and I have no idea how to solve this probelm.

Thanks!

[bicarlsen]

The error RuntimeError: asyncio.run() cannot be called from a running event loop indicates you are running the program from within an already running event loop (e.g. a Jupyter notebook, or in your case Spyder), but this doesn't seem to be an issue with the easy-biologic package.

[zhuzhangZZ]

Thanks for the information, I found that is the problem of the spyder or Jupyterbnotebook with the easy-biologic package, so I made some changes to the 'easy-biologic.program' file from

 if retrieve_data:
       asyncio.run( self._retrieve_data( read_interval ) )

to

if retrieve_data:
           thread = threading.Thread(
            target=lambda: asyncio.run(self._retrieve_data(read_interval))
           )
           thread.start()
           thread.join()

and now it works.

The reason is that I think the original code can run in the non-interactive environments like standalone scripts, but have the problem on interactive environments like Jypyter or Spyder

[bicarlsen]

Great! If you can find a way to make it work for both situations and is backwards compatible, you can submit a PR.