docs: def get_gzipped_contents(input_file):
      """
      Returns a gzipped version of a previously opened file's buffer.
      """
      zbuf = StringIO()
      zfile = GzipFile(mode="wb", compresslevel=6, fileobj=zbuf)
      zfile.write(input_file.read())
      zfile.close()
      return ContentFile(zbuf.getvalue())