title: Read specific bytes of file in python
body: <p>I want to specify an offset and then read the bytes of a file like </p>
  
  <pre><code>offset = 5
  read(5) 
  </code></pre>
  
  <p>and then read the next 6-10 etc. I read about seek but I cannot understand how it works and the examples arent descriptive enough.</p>
  
  <p><code>seek(offset,1)</code> returns what? </p>
  
  <p>Thanks</p>