title: Convert file to binary (make a hexdump)
body: <p>I want to display file that convert to binary like binary editer.</p>
  
  <p>For example, it convert PNG to 89 50 4E 47 0D 0A 1A 0A 00 00 00....</p>
  
  <pre><code>f = open(path, "r")
  print f.read() # I want to convert this to binary
  f.close()
  </code></pre>
  
  <p>Please advice me.</p>