title: How do I get python to read only every other line from a file that contains a poem
body: <p>I know the code for reading every line is </p>
  
  <pre><code>f=open ('poem.txt','r')
  for line in f: 
      print line 
  </code></pre>
  
  <p>how do you have python read only even-numbered lines from the original file. Assuming 1-based numbering of lines.</p>