How to display text or Popup in kivy while python sript is running

Hi everyone reading this topic.

That what i trying to do is: automaticly display text in Label after value is match in if statment. Second option could be Popup insted Label. Third way could be jump to different screen.

Please help me, i don't really know how can i connect this with kivy without using any buttons. Here are codes:

python:

from kivy.app import App
import random
from kivy.lang import Builder
from kivy.uix.screenmanager import ScreenManager, Screen

class Main(ScreenManager):
    pass

class Numbers(Screen):
    def __init__(self, **kwargs):
        super().__init__(**kwargs)


    def process(self):

        num_list = ['four','three']
        number = random.choice(num_list)
        self.number.text = number
        print(number)
        while True:

            if number == 'null':
                pass
            elif number == 'three':
                pass
            elif number == 'four':
                self.root.ids.numb.text="four"
                print(' for example Here i need connect code with kivy to display on screen text as string or jump to another screen')
                break
            else:
                pass
kv = Builder.load_file('temp.kv')


class NumbersApp(App):
    def build(self):
        return kv

if __name__ == '__main__':
    NumbersApp().run()

and kv file:

Main:
    Numbers:
<Numbers>:
    number:numb
    cols:1
    RelativeLayout:
        Label:
            id: numb
            text: 'Text display after getting \ninfo from script in while loop \nin process def'
            font_size: '15'
            hint_size: None, None
            pos_hint: {'x': 0.04, 'y': -0.4}
            color: 1,1,1,1

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