comefrom: <garvit244>226_1.py
code: def invertTree( root):
      if not root:
          return None
      
      queue = [root]
      while queue:
          node = queue.pop(0)
          node.left, node.right = node.right, node.left
          if node.left:
              queue.append(node.left)
          if node.right:
              queue.append(node.right)
      
      return root
masked: def sample_funcname ( var_0 ) :
      if not var_0 :
          return None
      var_2 = [ var_0 ]
      while var_2 :
          var_5 = var_2.pop ( 0 )
          var_5.left , var_5.right = var_5.right , var_5.left
          if var_5.left :
              var_2.append ( var_5.left )
          if var_5.right :
              var_2.append ( var_5.right )
      return var_0
  