title: Kivy - editing label when button clicked
body: <p>I wish button1 to edit Label 'etykietka' when clicked, but i don't know how. Have you got some ideas?</p>
  
  <pre><code>class Zastepstwa (App):
  
  def build(self):
      lista=WebOps().getList()
      layout = BoxLayout(orientation='vertical')
      etykietka = Label(text='aa', font_size=10)
      button1 = Button(text='aa')
      button1.bind(callback)
      layout.add_widget(etykietka)
      layout.add_widget(button)
      return layout
  
  def callback (instance):
      newLabelText='kkk'
      #?
  </code></pre>