title: list with infinite elments
body: <p>I need to operate on two separate <strong>infinite list</strong> of numbers, but could not find a way to generate, store and operate on it in python.</p>
  
  <p>Can any one please suggest me a way to handle infinite Arithmetic Progession or any series and how to operate on them considering the fact the minimal use of memory and time.</p>
  
  <p>Thanks every one for their suggestions in advance.</p>