code: def inorder(self):
      res = []
      if not self.root:
          return res
      stack = []
      root = self.root
      while root or stack:
          while root:
              stack.append(root)
              root = root.left
          root = stack.pop()
          res.append({"val": root.val, "color": root.color})
          root = root.right
      return res
  
file_path: keon-algos/algorithms/tree/red_black_tree/red_black_tree.py
label_desc: Use image node_id 11 for calling the RBTree obj's underlying member method code with example usage: obj.inorder() and returns: res, res