code: def match_seq(self, nodes, results=None):
          
          for c, r in self.generate_matches(nodes):
              if c == len(nodes):
                  if results is not None:
                      results.update(r)
                      if self.name:
                          results[self.name] = list(nodes)
                  return True
          return False
docs: Does this pattern exactly match a sequence of nodes?