title: Creating list from retrlines in Python
body: <p>How exactly would you create a list of the entries in an FTP directory?</p>
  
  <p>This is my code so far:</p>
  
  <pre><code>import ftplib
  
  files = []
  
  my_ftp = ftplib.FTP(HOST)
  my_ftp.login(USERNAME,PASSWORD)
  
  line = my_ftp.retrlines("NLST",files.append(line))
  my_ftp.quit()
  </code></pre>
  
  <p>The error says that the variable line is being used before it is defined.</p>