I wanted to ask about python kivy ... I don’t understand anything at all (Can you help?

Question

Python

Gentlemen... I've only been programming for 5 months recently and I decided to try kivy... Please don't swear at my code... I've looked at a bunch of YouTube videos and a bunch of sites about kivy... But still kivy is difficult for me.. ..
First of all, I don’t understand how to make the code not be executed all at once, but gradually .... Like, I have a problem, I want to make as many buttons as the user sets in the TextInput and then give this value to the next loop, but the code is executed all at once I don't understand what to do at all Help me please... That's what I wanted to do

class ScreenTwo7(Screen):
  def __init__(self, **kwargs):
    super().__init__(**kwargs)
    self.name = 'Sc7'
    AncL1 = AnchorLayout(anchor_y = 'top')
    NumberS1 = GridLayout(cols = 2, spacing = 2, padding = [0, 100, 0, 100] )
    AncL1.add_widget(NumberS1)
    for i in range(1):
      
      self.t2 = TextInput(text = 'Введите кол-во элементов выборки...')
      NumberS1.add_widget(self.t2)
      
      self.b2 = Button(text = 'Вывести поля для выборки')
      self.b2.bind(on_press = self.cicle)
      NumberS1.add_widget(self.b2)

      
    self.add_widget(AncL1)		
  def cicle(self, t):
    for n in  range(int(t.text)):
      NumberS1 = GridLayout(cols = 2, spacing = 2, padding = [0, 100, 0, 100] )
      self.t2 = TextInput(text = '#1')
      NumberS1.add_widget(self.t2)
      self.add_widget(NumberS1)

And there was also a question about how to transfer a value from one class to another ... I would like the user to press the button 7 on one screen, this number would be remembered in some variable and transferred to the next screen thanks for the answers ... If will..

Answer 1

So that the code is not executed all at once, but depending on the user's actions, you need to use events.
For example, on_text_validate of the TextInput widget.

#!/usr/bin/python
import kivy
from kivy.app import App
from kivy.uix.textinput import TextInput
from kivy.uix.gridlayout import GridLayout
from kivy.uix.button import Button

class RootWidget(GridLayout):
    def __init__(self, **kwargs):
        super(RootWidget, self).__init__(**kwargs)
        self.cols = 2
        self.add_widget(CreateInput(multiline=False))

class CreateInput(TextInput):
    def on_text_validate(self):
        for i in range(int(self.text)):
            self.parent.add_widget(Button(text=str(i)))

class MyApp(App):
    def build(self):
        return RootWidget()

if __name__ == "__main__":
    MyApp().run()