title: Python : How to detect any changes in the screen
body: <p>is there any code that can detect if any pixel color changes ?  </p>
  
  <p>what i want to do is to detect any change in a region if pixels  </p>
  
  <p>so if the color of any pixel in that region changed , it alerts me .  </p>
  
  <p>sorry for my bad English .  </p>