Gets the list of ``Comments`` associated with a ``Book``.

        arg:    book_id (osid.id.Id): ``Id`` of a ``Book``
        return: (osid.commenting.CommentList) - list of related comments
        raise:  NotFound - ``book_id`` is not found
        raise:  NullArgument - ``book_id`` is ``null``
        raise:  OperationFailed - unable to complete request
        raise:  PermissionDenied - authorization failure
        *compliance: mandatory -- This method must be implemented.*

def get_comments_by_book(self, book_id):
        """Gets the list of ``Comments`` associated with a ``Book``.

        arg:    book_id (osid.id.Id): ``Id`` of a ``Book``
        return: (osid.commenting.CommentList) - list of related comments
        raise:  NotFound - ``book_id`` is not found
        raise:  NullArgument - ``book_id`` is ``null``
        raise:  OperationFailed - unable to complete request
        raise:  PermissionDenied - authorization failure
        *compliance: mandatory -- This method must be implemented.*

        """
        # Implemented from template for
        # osid.resource.ResourceBinSession.get_resources_by_bin
        mgr = self._get_provider_manager('COMMENTING', local=True)
        lookup_session = mgr.get_comment_lookup_session_for_book(book_id, proxy=self._proxy)
        lookup_session.use_isolated_book_view()
        return lookup_session.get_comments()