title: How to write setter in kivy language(.kv) in python?
body: <p>How to write this line in .kv file in python Kivy ?</p>
  
  <pre><code>self.label.bind(size=self.label.setter('text_size'))
  </code></pre>
  
  <pre><code>&lt;KemAutomation&gt;
      Label:
          text: "Select Type Of Release" + "  " + "[color=ff3333](*)[/color]"
          pos_hint: {"center_x":.66, "center_y": .90}
          size_hint: (1.0, 1.0)
          font_name: "Candara"
          halign: "left"
          valign: "middle"
          markup: True
          font_size: '17dp'
  </code></pre>