def postinit(self, left=None, ops=None):
self.left = left<EOL>self.ops = ops<EOL>
Do some setup after initialisation.

        :param left: The value at the left being applied to a comparison
            operator.
        :type left: NodeNG or None

        :param ops: The remainder of the operators
            and their relevant right hand value.
        :type ops: list(tuple(str, NodeNG)) or None