[Feature]: Add support for Cython

Playwright version

1.12.1

Operating system

Linux

What browsers are you seeing the problem on?

Chromium

Other information

Python: 3.8.6 Cython: 0.29.21

What happened? / Describe the bug

Use Cython to compile the code into a so file and run it to prompt an error

Error dispatching the event Traceback (most recent call last):
  File "/home/sky/.local/lib/python3.8/site-packages/playwright/_impl/_connection.py", line 273, in _dispatch
    object._channel.emit(method, self._replace_guids_with_channels(params))
  File "/home/sky/.local/lib/python3.8/site-packages/pyee/_base.py", line 113, in emit
    handled = self._call_handlers(event, args, kwargs)
  File "/home/sky/.local/lib/python3.8/site-packages/pyee/_base.py", line 96, in _call_handlers
    self._emit_run(f, args, kwargs)
  File "/home/sky/.local/lib/python3.8/site-packages/pyee/_asyncio.py", line 42, in _emit_run
    self.emit('error', exc)
  File "/home/sky/.local/lib/python3.8/site-packages/pyee/_base.py", line 116, in emit
    self._emit_handle_potential_error(event, args[0] if args else None)
  File "/home/sky/.local/lib/python3.8/site-packages/pyee/_base.py", line 86, in _emit_handle_potential_error
    raise error
  File "/home/sky/.local/lib/python3.8/site-packages/pyee/_asyncio.py", line 40, in _emit_run
    coro = f(*args, **kwargs)
  File "/home/sky/.local/lib/python3.8/site-packages/playwright/_impl/_cdp_session.py", line 27, in <lambda>
    self._channel.on("event", lambda params: self._on_event(params))
  File "/home/sky/.local/lib/python3.8/site-packages/playwright/_impl/_cdp_session.py", line 30, in _on_event
    self.emit(params["method"], parse_result(params["params"]))
  File "/home/sky/.local/lib/python3.8/site-packages/pyee/_base.py", line 113, in emit
    handled = self._call_handlers(event, args, kwargs)
  File "/home/sky/.local/lib/python3.8/site-packages/pyee/_base.py", line 96, in _call_handlers
    self._emit_run(f, args, kwargs)
  File "/home/sky/.local/lib/python3.8/site-packages/pyee/_asyncio.py", line 42, in _emit_run
    self.emit('error', exc)
  File "/home/sky/.local/lib/python3.8/site-packages/pyee/_base.py", line 116, in emit
    self._emit_handle_potential_error(event, args[0] if args else None)
  File "/home/sky/.local/lib/python3.8/site-packages/pyee/_base.py", line 86, in _emit_handle_potential_error
    raise error
  File "/home/sky/.local/lib/python3.8/site-packages/pyee/_asyncio.py", line 40, in _emit_run
    coro = f(*args, **kwargs)
  File "/home/sky/.local/lib/python3.8/site-packages/playwright/_impl/_impl_to_api_mapping.py", line 88, in wrapper_func
    arg_count = len(inspect.signature(handler).parameters)
  File "/usr/lib/python3.8/inspect.py", line 3093, in signature
    return Signature.from_callable(obj, follow_wrapped=follow_wrapped)
  File "/usr/lib/python3.8/inspect.py", line 2842, in from_callable
    return _signature_from_callable(obj, sigcls=cls,
  File "/usr/lib/python3.8/inspect.py", line 2296, in _signature_from_callable
    return _signature_from_builtin(sigcls, obj,
  File "/usr/lib/python3.8/inspect.py", line 2107, in _signature_from_builtin
    raise ValueError("no signature found for builtin {!r}".format(func))
ValueError: no signature found for builtin <cyfunction BaseSpider.async_init_hook.<locals>.<lambda> at 0x7f5aee512520>

Code snippet to reproduce your bug

from playwright.async_api import async_playwright


def handle_dialog(request):
    pass


def finished_log(response):
    pass


def response_log(request):
    pass


def request_will_log(request):
    pass


def response_received_log(request):
    pass


def init_hook(page):
    page.on("dialog", handle_dialog)
    page.on("response", lambda response: response_log(response))
    page.on("requestfinished", lambda response: finished_log(response))


async def async_init_hook(page):
    client = await page.context.new_cdp_session(page)
    await client.send("Network.enable")
    client.on("Network.requestWillBeSent", lambda request: request_will_log(request))
    client.on("Network.responseReceived", lambda response: response_received_log(response))
    init_hook(page)


async def run_main():
    async with async_playwright() as p:
        browser = await p.chromium.launch()
        page = await browser.new_page()
        await async_init_hook(page)
        await page.goto("https://baidu.com")
        print(await page.title())
        await browser.close()

Relevant log output

No response

[kumaraditya303]

@mxschmitt fyi it is “Cython” not “CPython”

[mxschmitt]

Closed since this is not a Playwright bug and more a Cython bug. By that its not fixable from our side.