Using request_html in PySimpleGUI

gui.py

import threading
import asyncio

import PySimpleGUI as sg
from requests_html import AsyncHTMLSession
import pyppeteer


async def print_page_title(window):
    session = AsyncHTMLSession()
    browser = await pyppeteer.launch(
        {
            "ignoreHTTPSErrors": True,
            "headless": True,
            "handleSIGINT": False,
            "handleSIGTERM": False,
            "handleSIGHUP": False,
        }
    )
    session._browser = browser
    r = await session.get("http://python-requests.org/")
    await r.html.arender()
    window.write_event_value("-PrintTitle-", (r.html.find("title", first=True).text))
    await session.close()


def run(window):
    new_loop = asyncio.new_event_loop()
    asyncio.set_event_loop(new_loop)

    window.write_event_value("-PrintStatus-", ("Processing..."))
    asyncio.run(print_page_title(window))
    window.write_event_value("-PrintStatus-", ("Done!"))

    new_loop.close()


def main():
    layout = [
        [sg.Text("Status:"), sg.Text(key="-Status-", size=(20, 1))],
        [sg.Text("Title:"), sg.Text(key="-Title-", size=(20, 1))],
        [sg.Submit("Print page title")],
    ]

    window = sg.Window("Window Title", layout, finalize=True)

    while True:
        event, values = window.read()
        if event == sg.WIN_CLOSED:
            break
        if event == "Print page title":
            window["-Title-"].update("")
            threading.Thread(target=run, args=(window,), daemon=True).start()
        if event == "-PrintStatus-":
            window["-Status-"].update(values["-PrintStatus-"])
        if event == "-PrintTitle-":
            window["-Title-"].update(values["-PrintTitle-"])
    window.close()


if __name__ == "__main__":
    main()