code: def set_lineno(self, lineno, override=False):
          
          todo = deque([self])
          while todo:
              node = todo.popleft()
              if 'lineno' in node.attributes:
                  if node.lineno is None or override:
                      node.lineno = lineno
              todo.extend(node.iter_child_nodes())
          return self
docs: Set the line numbers of the node and children.