code: def _get_encoding(encoding_or_label):
      
      if hasattr(encoding_or_label, 'codec_info'):
          return encoding_or_label
  
      encoding = lookup(encoding_or_label)
      if encoding is None:
          raise LookupError('Unknown encoding label: %r' % encoding_or_label)
      return encoding
docs: Accept either an encoding object or label.
  
      :param encoding: An :class:`Encoding` object or a label string.
      :returns: An :class:`Encoding` object.
      :raises: :exc:`~exceptions.LookupError` for an unknown label.