comefrom: <qiyuangong>107_Binary_Tree_Level_Order_Traversal_II_1.py
code: def levelOrderBottom( root):
      if root is None:
          return []
      stack = [[root]]
      res = []
      while len(stack) > 0:
          top = stack.pop()
          res.insert(0, [t.val for t in top])
          temp = []
          for node in top:
              if node.left is not None:
                  temp.append(node.left)
              if node.right is not None:
                  temp.append(node.right)
          if len(temp) > 0:
              stack.append(temp)
      return res
masked: def sample_funcname ( var_0 ) :
      if var_0 is None :
          return [ ]
      var_2 = [ [ var_0 ] ]
      var_3 = [ ]
      while len ( var_2 ) > 0 :
          var_7 = var_2.pop ( )
          var_3.insert ( 0 , [ var_9.val for var_9 in var_7 ] )
          var_11 = [ ]
          for var_12 in var_7 :
              if var_12.left is not None :
                  var_11.append ( var_12.left )
              if var_12.right is not None :
                  var_11.append ( var_12.right )
          if len ( var_11 ) > 0 :
              var_2.append ( var_11 )
      return var_3
  