title: Bind TextInput to Label in .kv File
body: <p>I was following the tutorial video "Kivy crash course 3: More interesting widget interactions" by Alexander Taylor, but he is writing the code in python rather than in a .kv file. I was trying to follow the tutorial using a .kv file instead, but I am confused on how to bind the TextInput text to the label text.
  Is it possible to write it in the .kv file or does it have to be written in the .py file. Can you give an example?</p>
  
  <p>.py</p>
  
  <pre><code>from kivy.app import App
  
  from kivy.lang import Builder
  from kivy.uix.scatter import Scatter
  from kivy.uix.label import Label
  from kivy.uix.floatlayout import FloatLayout
  from kivy.uix.textinput import TextInput
  from kivy.uix.boxlayout import BoxLayout
  
  
  class MainApp(App):
  
      def build(self):
          return pres    
  
  pres = Builder.load_file("main.kv")
  
  if __name__ == "__main__":
      MainApp().run()
  </code></pre>
  
  <p>.kv</p>
  
  <pre><code>BoxLayout:
      orientation: 'vertical'
      TextInput:
          size_hint_y: None
          height: 200
          font_size: 150
          hint_text: "Enter Text"
          text: ""
      FloatLayout:
          Scatter:
              Label:
                  text: ""
                  font_size: 150
  </code></pre>