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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def set_based_on_grades(self, grades):
 """Sets the grade-based designation. arg: grades (boolean):
 the grade-based designation raise: InvalidArgument - ``grades`` is invalid raise: NoAccess - ``grades`` cannot be modified *compliance: mandatory -- This method must be implemented.* """

        # Implemented from template for osid.resource.ResourceForm.set_group_template
        if self.get_based_on_grades_metadata().is_read_only():
            raise errors.NoAccess()
        if not self._is_valid_boolean(grades):
            raise errors.InvalidArgument()
        self._my_map['basedOnGrades'] = grades