code: def concatenate(self, other):
          
  
          if self.is_absolute() and len(other) > 0:
              raise AbsoluteConcatenation
          labels = list(self.labels)
          labels.extend(list(other.labels))
          return Name(labels)
docs: Return a new name which is the concatenation of self and other.
          @rtype: dns.name.Name object
          @raises AbsoluteConcatenation: self is absolute and other is
          not the empty name