python-prompt-toolkit 2.0 rerun _(event) until different key is pressed

do you know if there is a simple solution to rerun the event in a loop but still be able to switch on key press?

for example

from prompt_toolkit import Application
from prompt_toolkit.key_binding import KeyBindings
import random

@kb.add('a')
def _(event):
    " Do something if 'a' has been pressed. "
    os.system('clear')
    print(‘you pressed a key’)
    print_formatted_text(random.randint(0,100))

@kb.add('u')
def _(event):
    " Do something if 'u' has been pressed. "
    print(‘you pressed u key’)
    print_formatted_text(random.randint(0,100))

app = Application(key_bindings=kb, full_screen=True)
with patch_stdout():
    app.run()

Start by reading the Application, KeyBindings, and app.run entry points used in the example, focusing on how key handlers return control to the application. Determine whether repeated work can continue while another key remains dispatchable, and verify that pressing a different key interrupts the repetition and invokes its handler.