The last statement in your Python code hangs because you are mixing synchronous and asynchronous code incorrectly. Here’s why:

The Problem

• asyncio.run is designed to run a single coroutine and manage the event loop. It creates a new event loop, runs the coroutine, and then closes the loop.
• In your code, you call asyncio.run twice:
  1. asyncio.run(async_playwright().start()) starts Playwright and returns a Playwright object (p).
  2. asyncio.run(p.firefox.launch(headless=False)) tries to launch a browser, but this is problematic because:
     • The first asyncio.run already closed the event loop after starting Playwright.
     • The second asyncio.run tries to create a new event loop, but Playwright was started in the previous loop, which is now closed. This leads to a conflict and the code hangs.

How to Fix It

You should use a single asyncio.run and structure your code as a single coroutine:

python
Copy
import asyncio
from playwright.async_api import async_playwright

async def main():
    async with async_playwright() as p:
        browser = await p.firefox.launch(headless=False)
        # Do something with the browser here
        await browser.close()

asyncio.run(main())

Key Points:

• Use async with to manage the Playwright context.
• Use a single asyncio.run to run the entire async workflow.
• Always await async functions like launch.

This way, the event loop is managed correctly, and the code will not hang.