docs: def get_comments_on_date(self, from_, to):
          """Gets a ``CommentList`` effective during the entire given date range inclusive but not confined to the date range.
  
          arg:    from (osid.calendaring.DateTime): starting date
          arg:    to (osid.calendaring.DateTime): ending date
          return: (osid.commenting.CommentList) - the returned ``Comment``
                  list
          raise:  InvalidArgument - ``from`` is greater than ``to``
          raise:  NullArgument - ``from`` or ``to`` is ``null``
          raise:  OperationFailed - unable to complete request
          raise:  PermissionDenied - authorization failure
          *compliance: mandatory -- This method must be implemented.*
  
          """
          # Implemented from template for
          # osid.relationship.RelationshipLookupSession.get_relationships_on_date
          comment_list = []
          for comment in self.get_comments():
              if overlap(from_, to, comment.start_date, comment.end_date):
                  comment_list.append(comment)
          return objects.CommentList(comment_list, runtime=self._runtime)