How do I make two loops?

Question

I have PyHook loop

hm = pyHook.HookManager()
hm.KeyDown = Ob.on_keyboard_event
hm.HookKeyboard()
pythoncom.PumpMessages()

that initiates Ob.on_keyboard_event every time event.Ascii comes around from the keyboard. Because it doesn't recognize layout switch on its own def keyboard(self) scans for layout. But def keyboard_layout(self) just like on_keyboard_event works only after an even has come so there is a lag in 1 character before the layout is changed. I want to make a second loop out of def keyboard_layout(self) so it would independently check layout every 0.5s and change it if needed. Right now it happens as

def on_keyboard_event(self, event):

    a = self.keyboard_layout()

    if a == hex(0x4090409):

        win32api.LoadKeyboardLayout("00000409", 1)

    else:

        win32api.LoadKeyboardLayout("00000419", 1)