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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 __applytns(self, root):
 """Make sure included schema has the same target namespace."""

        TNS = "targetNamespace"
        tns = root.get(TNS)
        if tns is None:
            tns = self.schema.tns[1]
            root.set(TNS, tns)
        else:
            if self.schema.tns[1] != tns:
                raise Exception, "%s mismatch" % TNS