@utilities.arguments_not_none<EOL><INDENT>def get_comments_by_book(self, book_id):<DEDENT>
<EOL>mgr = self._get_provider_manager('<STR_LIT>', local=True)<EOL>lookup_session = mgr.get_comment_lookup_session_for_book(book_id, proxy=self._proxy)<EOL>lookup_session.use_isolated_book_view()<EOL>return lookup_session.get_comments()<EOL>
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.*