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I've got two issues that I can't solve it at them moment.

1. I would like to keep the browser running so I could just re-connect using pyppeteer.launcher.connect() function but it seems to be closed imidiately even if I don't call pyppeteer.browser.Browser.close() .

test01.py:

import asyncio
from pyppeteer import launch, connect
async def fetch():
    browser = await launch(
        headless=False,
        args=['--no-sandbox']
    print(f'Endpoint: {browser.wsEndpoint}')
    await browser.disconnect()
loop = asyncio.get_event_loop()
loop.run_until_complete(fetch())
$ python test01.py
Endpoint: ws://127.0.0.1:51757/devtools/browser/00e917a9-c031-499a-a8ee-ca4090ebd3fe
$ curl -i -N -H "Connection: Upgrade" -H "Upgrade: websocket" http://127.0.0.1:51757
curl: (7) Failed to connect to 127.0.0.1 port 51757: Connection refused
2. How do I create CDP session. This code should open another browser window but it doesn't work as expected:
test02.py
import asyncio
import time
from pyppeteer import launch, connect
async def fetch():
    browser = await launch(
        headless=False,
        args=['--no-sandbox']
    page = await browser.newPage()
    cdp = await page.target.createCDPSession()
    await cdp.send('Target.createBrowserContext')
    time.sleep(5)
    await browser.disconnect()
loop = asyncio.get_event_loop()
loop.run_until_complete(fetch())
$ python test02.py
Future exception was never retrieved
future: <Future finished exception=NetworkError('Protocol error Target.sendMessageToTarget: Target closed.',)>
pyppeteer.errors.NetworkError: Protocol error Target.sendMessageToTarget: Target closed.
  
autoClose (bool): Automatically close browser process when script
  completed. Defaults to True.
In this case you test01.py would look as follows:
import asyncio
from pyppeteer import launch, connect
async def fetch():
    browser = await launch(
        headless=False,
        args=['--no-sandbox'],
        autoClose=False
    print(f'Endpoint: {browser.wsEndpoint}')
    await browser.disconnect()
loop = asyncio.get_event_loop()
loop.run_until_complete(fetch())
CDP session
Here it is:
import asyncio
import time
from pprint import pprint
from pyppeteer import launch, connect
from pyppeteer.browser import BrowserContext
async def fetch():
    browser = await launch(
        headless=False,
        args=['--no-sandbox'],
        autoClose=False
    page = await browser.newPage()
    cdp = await page.target.createCDPSession()
    raw_context = await cdp.send('Target.createBrowserContext')
    pprint(raw_context)
    context = BrowserContext(browser, raw_context['browserContextId'])
    new_page = await context.newPage()
    await cdp.detach()
    await browser.disconnect()
loop = asyncio.get_event_loop()
loop.run_until_complete(fetch())
Inspired by Browser.createIncognitoBrowserContext from pyppeteer itself.
Notice creating additional sessions via CDP doesn't seem to be such a great idea because browser._contexts won't be updated and will become inconsistent. It's also likely that Browser.createIncognitoBrowserContext might fit your needs without resorting to CDP whatsoever
        
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