human
Solve the following python programming problem given the following code:
def dfs_postorder_nodes(graph, root) : 
    import sys 
    sys.setrecursionlimit (500) 
    visited = set () 
    def _dfs(node, _visited) : 
        _visited.add (node) 
        for edge in graph.out_edges (node) : 
            dest_node = edge.dest 
            if (dest_node not in _visited) : 
                for child in _dfs (dest_node, _visited) : 
                    (yield child) 
(yield node) 
return [n for n in _dfs (root, root)] 

    
    

    Fix the buggy line: return [n for n in _dfs (root, root)]
assistant
#Here is Python program to fix the buggy line: return [n for n in _dfs (root, root)]
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return [n for n in _dfs (root, visited)]