human
Solve the following python programming problem given the following code:
def post_order(self) : 
    '
        Return the nodes of the graph in post-order i.e we visit all the
        children of a node before visiting the node itself.
        ' 
    def _visit(n, cnt) : 
        visited.add (n) 
        for suc in self.all_sucs (n) : 
            if (not (suc in visited)) : 
                for (cnt, s) in _visit (suc, cnt) : 
                    (yield (cnt, s)) 
n.po = cnt 
        (yield ((cnt + 1), n)) 
visited = set () 
    for (_, node) in _visit (_visit.entry, 1) : 
        (yield node) 

    
    

    Fix the buggy line: for (_, node) in _visit (_visit.entry, 1) :
assistant
#Here is Python program to fix the buggy line: for (_, node) in _visit (_visit.

for (_, node) in _visit (self.entry, 1) :