old_contents: import gobject
  import gio
  import gtk
  
  def callback(gfile, result):
      for file_info in gfile.enumerate_children_finish(result):
          print file_info.get_name()
      loop.quit()
  
  gfile = gio.File("/")
  gfile.enumerate_children_async("standard::*", callback)
  
  loop = gobject.MainLoop()
  loop.run()
  
new_contents: import gobject
  import gio
  
  def callback(gfile, result):
      for file_info in gfile.enumerate_children_finish(result):
          print file_info.get_name()
      loop.quit()
  
  gfile = gio.File("/")
  gfile.enumerate_children_async("standard::*", callback)
  
  loop = gobject.MainLoop()
  loop.run()
  
subject: Remove unused import