[Bug]: AsyncPlaywright(next(iter(done)).result()) throws NotImplementedError in jupyter notebook

[datoslabs]

Version

1.49.1

Steps to reproduce

Run the following in jupyter notebook:

import asyncio
import nest_asyncio
nest_asyncio.apply()
from playwright.async_api import async_playwright

asyncio.set_event_loop_policy(asyncio.WindowsProactorEventLoopPolicy())

async def test_browser():
    async with async_playwright() as p:
        browser = await p.chromium.launch(headless=True)
        page = await browser.new_page()
        await page.goto('https://example.com')
        print(f'Title: {await page.title()}')
        await browser.close()

print(type(asyncio.get_event_loop_policy()))
await test_browser()

Please note, NotImplementedError only occurs inside Jupyter notebook; equivalent code running in python cli works fine.

Expected behavior

Expected output:

<class 'asyncio.windows_events.WindowsProactorEventLoopPolicy'>
Title: Example Domain

Actual behavior

Generated NotImplementedError, output as follows:

Output/trace:

<class 'asyncio.windows_events.WindowsProactorEventLoopPolicy'>
---------------------------------------------------------------------------
NotImplementedError                       Traceback (most recent call last)
Cell In[2], line 22
     19         await browser.close()
     21 print(type(asyncio.get_event_loop_policy()))
---> 22 await test_browser()

Cell In[2], line 14, in test_browser()
     13 async def test_browser():
---> 14     async with async_playwright() as p:
     15         browser = await p.chromium.launch(headless=True)
     16         page = await browser.new_page()

File [d:\Users\xyz\.conda\envs\ai-crawler-3.11\Lib\site-packages\playwright\async_api\_context_manager.py:46](file:///D:/Users/xyz/.conda/envs/ai-crawler-3.11/Lib/site-packages/playwright/async_api/_context_manager.py#line=45), in PlaywrightContextManager.__aenter__(self)
     44 if not playwright_future.done():
     45     playwright_future.cancel()
---> 46 playwright = AsyncPlaywright(next(iter(done)).result())
     47 playwright.stop = self.__aexit__  # type: ignore
     48 return playwright

File [d:\Users\xyz\.conda\envs\ai-crawler-3.11\Lib\asyncio\futures.py:203](file:///D:/Users/xyz/.conda/envs/ai-crawler-3.11/Lib/asyncio/futures.py#line=202), in Future.result(self)
    201 self.__log_traceback = False
    202 if self._exception is not None:
--> 203     raise self._exception.with_traceback(self._exception_tb)
    204 return self._result

File [d:\Users\xyz\.conda\envs\ai-crawler-3.11\Lib\site-packages\playwright\_impl\_transport.py:120](file:///D:/Users/xyz/.conda/envs/ai-crawler-3.11/Lib/site-packages/playwright/_impl/_transport.py#line=119), in PipeTransport.connect(self)
    117         startupinfo.wShowWindow = subprocess.SW_HIDE
    119     executable_path, entrypoint_path = compute_driver_executable()
--> 120     self._proc = await asyncio.create_subprocess_exec(
    121         executable_path,
    122         entrypoint_path,
    123         "run-driver",
    124         stdin=asyncio.subprocess.PIPE,
    125         stdout=asyncio.subprocess.PIPE,
    126         stderr=_get_stderr_fileno(),
    127         limit=32768,
    128         env=env,
    129         startupinfo=startupinfo,
    130     )
    131 except Exception as exc:
    132     self.on_error_future.set_exception(exc)

File [d:\Users\xyz\.conda\envs\ai-crawler-3.11\Lib\asyncio\subprocess.py:223](file:///D:/Users/xyz/.conda/envs/ai-crawler-3.11/Lib/asyncio/subprocess.py#line=222), in create_subprocess_exec(program, stdin, stdout, stderr, limit, *args, **kwds)
    220 loop = events.get_running_loop()
    221 protocol_factory = lambda: SubprocessStreamProtocol(limit=limit,
    222                                                     loop=loop)
--> 223 transport, protocol = await loop.subprocess_exec(
    224     protocol_factory,
    225     program, *args,
    226     stdin=stdin, stdout=stdout,
    227     stderr=stderr, **kwds)
    228 return Process(transport, protocol, loop)

File [d:\Users\xyz\.conda\envs\ai-crawler-3.11\Lib\asyncio\base_events.py:1708](file:///D:/Users/xyz/.conda/envs/ai-crawler-3.11/Lib/asyncio/base_events.py#line=1707), in BaseEventLoop.subprocess_exec(self, protocol_factory, program, stdin, stdout, stderr, universal_newlines, shell, bufsize, encoding, errors, text, *args, **kwargs)
   1706     debug_log = f'execute program {program!r}'
   1707     self._log_subprocess(debug_log, stdin, stdout, stderr)
-> 1708 transport = await self._make_subprocess_transport(
   1709     protocol, popen_args, False, stdin, stdout, stderr,
   1710     bufsize, **kwargs)
   1711 if self._debug and debug_log is not None:
   1712     logger.info('%s: %r', debug_log, transport)

File [d:\Users\xyz\.conda\envs\ai-crawler-3.11\Lib\asyncio\base_events.py:503](file:///D:/Users/xyz/.conda/envs/ai-crawler-3.11/Lib/asyncio/base_events.py#line=502), in BaseEventLoop._make_subprocess_transport(self, protocol, args, shell, stdin, stdout, stderr, bufsize, extra, **kwargs)
    499 async def _make_subprocess_transport(self, protocol, args, shell,
    500                                      stdin, stdout, stderr, bufsize,
    501                                      extra=None, **kwargs):
    502     """Create subprocess transport."""
--> 503     raise NotImplementedError

NotImplementedError:

Additional context

No response

Environment

Python 3.11.11

- Operating System: Windows 11 Home Version 10.0.26120 Build 26120
- CPU: [core i7]
- Browser: [All, Chromium, Firefox, WebKit]
- Python Version: [3.11.11]
- Other info:

[mxschmitt]

If it works without Jupyter it sounds like a Jupyter book to me - I recommend filing it against them since we unfortunately don't have any experience around Jupyter notebooks.

Closing since we can't act on it.