[Python] Pass text from watchdog to PyQT application

The task is to get a GUI application that will track file system changes and write a log in real time to a text widget. Currently, file system changes are output only to the console. Any ideas on how to send text from one class to another?

class EventHandler(FileSystemEventHandler):

def on_any_event(self, event: FileSystemEvent) -> None:
'''pass event to plain_text widget PyQT app'''
print(event)


class MainWindow(QMainWindow):
...

def set_text(self, text) -> None:
self.plain_text.setPlainText(
self.plain_text.toPlainText() + text + '\n'
)

def thread_watchdog(self) -> None:
self.event_handler = EventHandler()
self.observer = Observer()
self.observer.schedule(self.event_handler, self.line_path_input.text(), recursive=False)
self.observer.start()
try:
while True:
if self.is_stop.is_set():
break
time.sleep(1)
finally:
self.observer.stop()
self.observer.join()


def run_watchdog(self) -> None:
self.set_text('started')
self.thread = Thread(target=self.thread_watchdog)
self.thread.start()

app = QApplication(sys.argv)
window = MainWindow()
app.exec_()

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