code: def register_prefix(self, nspair):
          
          for prefix, uri in nspair.items():
              try:
                  ElementTree.register_namespace(prefix, uri)
              except AttributeError:
                  # Backwards compatibility with ET < 1.3
                  ElementTree._namespace_map[uri] = prefix
              except ValueError:
                  pass
docs: Register with ElementTree a set of namespaces
  
          :param nspair: A dictionary of prefixes and uris to use when
              constructing the text representation.
          :return: