title: Eclipse Pydev error
body: <p>I am using Win 8, Eclipse and Pydev. I installed Pydev and it can run simple python script.
  Unfortunately I want to use math module and it gets error sign next to math command. 
  <img src="https://i.stack.imgur.com/iEN1s.png" alt="enter image description here"> </p>
  
  <p>Undefined variable.</p>
  
  <p>I would be very thankful if you can help me to get rid of the error sign.</p>
  
  <p>Best regards,
  Peter</p>