@abc.abstractmethod<EOL><INDENT>def is_graded(self):<DEDENT>
return<EOL>
Tests if a grade or score has been assigned to this entry.

        Generally, an entry is created with a grade or score.

        :return: ``true`` if a grade has been assigned, ``false`` otherwise
        :rtype: ``boolean``


        *compliance: mandatory -- This method must be implemented.*