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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def findNode(self, node):
 """ Find the node on the graph """

        ident = self.getRawIdent(node)
        if ident is None:
            ident = node
        try:
            return self.graph.node_data(ident)
        except KeyError:
            return None