title: How to set schedule time of clock in Kivy while using Python?
body: <p>I am trying to make the program using Kivy in Python in which a particular function do executes after certain period of time.</p>
  
  <pre><code>def repeat(dt):
      print "My callback is called",dt
  Clock.schedule_interval(repeat,1/30.)
  </code></pre>
  
  <p>The above is the code that i have wrote down but there is a error whose image i am attaching with this description. Please help me out and guide me how to work with Kivy in Python in a productive manner.<img src="https://i.stack.imgur.com/ZGDHV.png" alt="error log"></p>