RuntimeError: Event loop is closed

It seems from the traceback that a Runtime error is triggered at:
File "/usr/local/lib/python3.8/dist-packages/prompt_toolkit/application/application.py", line 816, in run
return loop.run_until_complete(

It seems to be triggered when multiple libs interact. It is difficult to pin-point which lib is most responsible, but the tracestack shows prompt-toolkit as the first non-standard one. Sorry.

Can you help?

I run Python 3.8.6, prompt_toolkit.version = '3.0.8'
======SMALL PYTHON SCRIPT TO TEST IT====================

#!/usr/bin/python3
import subprocess
from questionary import prompt, Separator
from datalad import api as datalad

question = [{'type': 'list', 'name': 'choice', 'message': 'Menu', 'choices': ['Red pill','Blue pill']}]
print("You have to take four pills")
for i in range(4):
  answer = prompt(question)
  name =  answer['choice'].replace(' ','_')+str(i)
  print("Create path: "+name)
  ### does not work
  ds = datalad.create(name, cfg_proc='text2git')
  ### works perfectly
  # cmd = ['datalad','create','-c','text2git',name]
  # output = subprocess.run(cmd, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
  print("Log: dataset created. Success")

=========MY OUTPUT ==========================================

You have to take four pills                                                                                                                                                                  
? Menu  Blue pill
Create path: Blue_pill0
[INFO   ] Creating a new annex repo at /home/sbrinckm/tttttt/Blue_pill0 
[INFO   ] Running procedure cfg_text2git 
[INFO   ] == Command start (output follows) ===== 
[INFO   ] == Command exit (modification check follows) ===== 
Log: dataset created. Success
Traceback (most recent call last):
  File "short.py", line 9, in <module>
    answer = prompt(question)
  File "/usr/local/lib/python3.8/dist-packages/questionary/prompt.py", line 97, in prompt
    answer = question.unsafe_ask(patch_stdout)
  File "/usr/local/lib/python3.8/dist-packages/questionary/question.py", line 59, in unsafe_ask
    return self.application.run()
  File "/usr/local/lib/python3.8/dist-packages/prompt_toolkit/application/application.py", line 816, in run
    return loop.run_until_complete(
  File "/usr/lib/python3.8/asyncio/base_events.py", line 591, in run_until_complete
    self._check_closed()
  File "/usr/lib/python3.8/asyncio/base_events.py", line 508, in _check_closed
    raise RuntimeError('Event loop is closed')
RuntimeError: Event loop is closed
sys:1: RuntimeWarning: coroutine 'Application.run_async' was never awaited

================================================================

Start by reproducing the supplied script with Python 3.8.6 and prompt_toolkit 3.0.8, then inspect prompt_toolkit/application/application.py around application.run at line 816. Compare the repeated prompt call after datalad.create with the subprocess variant. Done means the repeated prompts no longer fail with a closed event loop or emit the unawaited coroutine warning.