code: def operation(self, name):
          
          try:
              return self.operations[name]
          except Exception, e:
              raise MethodNotFound(name)
docs: Shortcut used to get a contained operation by name.
  
          @param name: An operation name.
          @type name: str
          @return: The named operation.
          @rtype: Operation
          @raise L{MethodNotFound}: When not found.