human
Solve the following python programming problem given the following code:
def _SetExpressionPenalty(self, node, penalty) : 
    'Set an ARITHMETIC_EXPRESSION penalty annotation children nodes.' 
    def RecArithmeticExpression(node, first_child_leaf) : 
        if (node is first_child_leaf) : 
            return 
if isinstance (node, pytree.Leaf) : 
            if (node.value in { '(', 'for', 'if' }) : 
                return 
penalty_annotation = pytree_utils.GetNodeAnnotation (node, pytree_utils.Annotation.SPLIT_PENALTY, default = 0) 
            if (penalty_annotation < penalty) : 
                pytree_utils.SetNodeAnnotation (node, pytree_utils.Annotation.SPLIT_PENALTY, penalty) 
else : 
            for child in node.children : 
                RecArithmeticExpression (child, first_child_leaf) 
RecArithmeticExpression (penalty, _FirstChildNode (node)) 

    
    

    Fix the buggy line: RecArithmeticExpression (penalty, _FirstChildNode (node))
assistant
#Here is Python code to fix the buggy line: RecArithmeticExpression (penalty, _FirstChildNode (node))
.

RecArithmeticExpression (node, _FirstChildNode (node))