title: Show dialog with a "Circle Loading Icon" in python
body: <p>My question is simple, i want to show a dialog with an animated circle like this
  <img src="https://i.stack.imgur.com/P1Zm7.gif" alt="enter image description here"></p>
  
  <p>Is there a portable way to do this and without using .gif images?<br>
  NOTE: the image was an example, i want to use the one included in pygtk</p>