code: def repository_compare(self, from_, to, **kwargs):
          
          path = '/projects/%s/repository/compare' % self.get_id()
          query_data = {'from': from_, 'to': to}
          return self.manager.gitlab.http_get(path, query_data=query_data,
                                              **kwargs)
docs: Return a diff between two branches/commits.
  
          Args:
              from_(str): Source branch/SHA
              to(str): Destination branch/SHA
              **kwargs: Extra options to send to the server (e.g. sudo)
  
          Raises:
              GitlabAuthenticationError: If authentication is not correct
              GitlabGetError: If the server failed to perform the request
  
          Returns:
              str: The diff