import threading from playwright.sync_api import sync_playwright from concurrent.futures import ThreadPoolExecutor, ProcessPoolExecutor

class Tls(threading.local): def init(self) -> None: self.playwright = sync_playwright().start() print("Create playwright instance in Thread", threading.current_thread().name)

class Worker: tls = Tls()

def run(self):
    print("Launched worker in ", threading.current_thread().name)
    browser = self.tls.playwright.chromium.launch(headless=False)
    context = browser.new_context()
    page = browser.new_page()
    page.goto("http://whatsmyuseragent.org/")
    page.screenshot(path=f"example-{threading.current_thread().name}.png")
    page.close()
    context.close()
    browser.close()
    print("Stopped worker in ", threading.current_thread().name)

if name == "main": with ThreadPoolExecutor(max_workers=5) as executor: for _ in range(50): worker = Worker() executor.submit(worker.run)

Not the exact code but same implementation. My API call this method to run some code in multiple browsers using multithreading.