def getReadGroupSetByName(self, name):
        """
        Returns a ReadGroupSet with the specified name, or raises a
        ReadGroupSetNameNotFoundException if it does not exist.
        """
        if name not in self._readGroupSetNameMap:
            raise exceptions.ReadGroupSetNameNotFoundException(name)
        return self._readGroupSetNameMap[name]
Returns a ReadGroupSet with the specified name, or raises a
        ReadGroupSetNameNotFoundException if it does not exist.