title: When should I use numpy?
body: <p>I'm a newbee of python. And recently I heard some people say that numpy is a good module for dealing with huge data.</p>
  
  <p>I'm curious what can numpy do for us in the daily work.</p>
  
  <p>As I know, most of us were not scientists and researchers, at what circumstances numpy can bring us benefit? </p>
  
  <p>Can you share a good practice with me?</p>