I have Windows 11 and Python 3.12.3 and wish to experiment with the asyncio REPL. It works fine with the built-in REPL:

python -m asyncio

PS C:> python -m asyncio
asyncio REPL 3.12.3 (tags/v3.12.3:f6650f9, Apr  9 2024, 14:05:25) [MSC v.1938 64 bit (AMD64)] on win32
Use "await" directly instead of "asyncio.run()".
Type "help", "copyright", "credits" or "license" for more information.
>>> import asyncio
>>> await asyncio.sleep(1, 'Done!')
'Done!'
>>> exit()

However, I cannot get it to work with ptpython:

PS C:> ptpython --asyncio

Starting ptpython asyncio REPL
Use "await" directly instead of "asyncio.run()".
In [1]: await asyncio.sleep(1, 'Done!')
Traceback (most recent call last):
  File "C:UsersjamesAppDataRoamingPythonPython312site-packagesptpythonrepl.py", line 183, in run_and_show_expression_async
    loop.add_signal_handler(signal.SIGINT, lambda *_: task.cancel())
  File "C:Program FilesPython312Libasyncioevents.py", line 582, in add_signal_handler
    raise NotImplementedError
NotImplementedError

Traceback (most recent call last):
  File "<frozen runpy>", line 198, in _run_module_as_main
  File "<frozen runpy>", line 88, in _run_code
  File "C:UsersjamesAppDataRoamingPythonPython312Scriptsptpython.exe__main__.py", line 7, in <module>

  File "C:UsersjamesAppDataRoamingPythonPython312site-packagesptpythonentry_pointsrun_ptpython.py", line 231, in run

    asyncio.run(embed_result)
  File "C:Program FilesPython312Libasynciorunners.py", line 194, in run
    return runner.run(main)
           ^^^^^^^^^^^^^^^^
  File "C:Program FilesPython312Libasynciorunners.py", line 118, in run
    return self._loop.run_until_complete(task)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:Program FilesPython312Libasynciobase_events.py", line 687, in run_until_complete

    return future.result()
           ^^^^^^^^^^^^^^^
  File "C:UsersjamesAppDataRoamingPythonPython312site-packagesptpythonrepl.py", line 528, in coroutine

    await repl.run_async()
  File "C:UsersjamesAppDataRoamingPythonPython312site-packagesptpythonrepl.py", line 252, in run_async

    await self.run_and_show_expression_async(text)
  File "C:UsersjamesAppDataRoamingPythonPython312site-packagesptpythonrepl.py", line 206, in run_and_show_expression_async

    loop.remove_signal_handler(signal.SIGINT)
  File "C:Program FilesPython312Libasyncioevents.py", line 585, in remove_signal_handler

    raise NotImplementedError
NotImplementedError
Task exception was never retrieved
future: <Task finished name='Task-314' coro=<PythonRepl.run_and_show_expression_async.<locals>.eval() done, defined at C:UsersjamesAppDataRoamingPythonPython312site-packagesptpythonrepl.py:172> exception=NameError("name 'asyncio' is not defined")>


Traceback (most recent call last):
  File "C:UsersjamesAppDataRoamingPythonPython312site-packagesptpythonrepl.py", line 175, in eval

    return await self.eval_async(text)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:UsersjamesAppDataRoamingPythonPython312site-packagesptpythonrepl.py", line 329, in eval_async

    result = await result
             ^^^^^^^^^^^^
  File "<stdin>", line 1, in <module>
NameError: name 'asyncio' is not defined. Did you forget to import 'asyncio'

From the ptpython docs, this should work – a similar example is shown working:
https://github.com/prompt-toolkit/ptpython

How do I get ptpython to work in asyncio mode on Windows 11?