old_contents: import os
  
  
  def main():
      mypath = "/var/www/files"
      downloads_folder = "downloads"
      files = [f for f in os.listdir("{}/{}".format(mypath, downloads_folder))
               if f.endswith(".mp3")]
  
      feeds = [f for f in os.listdir(mypath) if f.endswith(".xml")]
  
      to_delete = files
      for feed_name in feeds:
          for file_name in files:
              if file_name in open("{}/{}".format(mypath, feed_name)).read():
                  to_delete.remove(file_name)
  
      for file_name in to_delete:
          print("removing {}".format(file_name)
          os.remove("{}/{}/{}".format(mypath, downloads_folder, file_name))
  
  if __name__ == "__main__":
      main()
  
new_contents: import os
  
  
  def main():
      mypath = "/var/www/files"
      downloads_folder = "downloads"
      files = [f for f in os.listdir("{}/{}".format(mypath, downloads_folder))
               if f.endswith(".mp3")]
  
      feeds = [f for f in os.listdir(mypath) if f.endswith(".xml")]
  
      to_delete = files
      for feed_name in feeds:
          for file_name in files:
              if file_name in open("{}/{}".format(mypath, feed_name)).read():
                  to_delete.remove(file_name)
  
      for file_name in to_delete:
          print("removing {}".format(file_name))
          os.remove("{}/{}/{}".format(mypath, downloads_folder, file_name))
  
  if __name__ == "__main__":
      main()
  
subject: fix typo