prompt toolkit run functions simultaneously - python-3.x

Question

I am trying to run the testprt() function simultaneously with the prompt_toolkit but if I am trying it normally its waiting and after the testprt() functions is run the menu starts but I want it too start simultaneously. I tried it with normal threading and starting the thread in the run function. (This is the code without my threading code) how do I run the testprt() function simultaneously?
from __future__ import unicode_literals
from prompt_toolkit.application import Application
from prompt_toolkit.key_binding import KeyBindings
from prompt_toolkit.layout.containers import VSplit, HSplit, Window
from prompt_toolkit.layout.controls import FormattedTextControl, BufferControl
from prompt_toolkit.layout.layout import Layout
from prompt_toolkit.buffer import Buffer
from prompt_toolkit import prompt
from prompt_toolkit.eventloop.defaults import use_asyncio_event_loop
from prompt_toolkit.patch_stdout import patch_stdout
import threading
import time
## LOGIC
def testprt():
up_r_buffer.text = "1\n"
time.sleep(1)
up_r_buffer.text = "2\n"
time.sleep(1)
up_r_buffer.text = "3\n"
time.sleep(1)
up_r_buffer.text = "4\n"
time.sleep(1)
up_r_buffer.text = "5\n"
time.sleep(1)
up_r_buffer = Buffer()
up_l_buffer = Buffer()
down_buffer = Buffer()
# 1. The layout
top_text = (
"Menu.\n"
"[q] Quit [TAB] To switch."
)
left_top = Window(BufferControl(buffer=up_l_buffer))
right_top = Window(BufferControl(buffer=up_r_buffer))
down_buffer = Window(BufferControl(buffer=down_buffer))
body = HSplit([
Window(FormattedTextControl(top_text), height=2, style='reverse'),
Window(height=1, char='-'), # Horizontal line in the middle.
VSplit([
left_top,
Window(width=1, char='|'),
right_top
]),
Window(height=1, char='-'), # Horizontal line in the middle.
VSplit([
down_buffer
]),
])
# 2. Key bindings
kb = KeyBindings()
#kb.add('q')
def _(event):
" Quit application. "
event.app.exit()
#kb.add('tab')
def _(event):
event.app.layout.focus_next()
#kb.add('s-tab')
def _(event):
event.app.layout.focus_previous()
#kb.add('m')
def _(event):
up_r_buffer.text = "FuckOFF\n"
# 3. The `Application`
application = Application(
layout=Layout(body),
key_bindings=kb,
full_screen=True,
)
def run():
application.run()
if __name__ == '__main__':
run()