code: def include_yaml(self, node):
          '''
          load another yaml file from the path specified by node's value
          '''
          filename = self.construct_scalar(node)
          if not filename.startswith('/'):
              if self._root is None:
                  raise Exception('!include_yaml %s is a relative path, '
                                  'but stream lacks path' % filename)
              filename = os.path.join(self._root, self.construct_scalar(node))
          with self.open(filename, 'r') as fin:
              return yaml.load(fin, Loaderf include_yaml(self, node):
          '''
          load another yaml file from the path specified by node's value
          '''
          filename = self.construct_scalar(node)
          if not filename.startswith('/'):
              if self._root is None:
                  raise Exception('!include_yaml %s is a relative path, '
                                  'but stream lacks path' % filename)
              filename = os.path.join(self._root, self.construct_scalar(node))
          with self.open(filename, 'r') as fin:
              return yaml.load(fin, Loader)
docs: load another yaml file from the path specified by node's value