code: def _spec(self, name):
          "Return the named spec."
          for s in self._framespec:
              if s.name == name:
                  return s
          raise ValueError("Unknown spec: " + namef _spec(self, name):
          "Return the named spec."
          for s in self._framespec:
              if s.name == name:
                  return s
          raise ValueError("Unknown spec: " + name)
docs: Return the named spec.