code: def filename(self):
          
          if os.path.splitext(self.destination)[1]:
              # If the filename has been given make use of it
              target_file = self.destination
          else:
              # Otherwise determine it from the url.
              parsed_url = urlparse(self.url)
              source_filename = (parsed_url.path.rpartition('/')[-1] or
                                 parsed_url.hostname)
              target_file = os.path.join(self.destination, source_filename)
  
          return os.path.abspath(target_file)
docs: File name of the downloaded file.