def postinit(self, target, annotation, simple, value=None):
self.target = target<EOL>self.annotation = annotation<EOL>self.value = value<EOL>self.simple = simple<EOL>
Do some setup after initialisation.

        :param target: What is being assigned to.
        :type target: NodeNG

        :param annotation: The type annotation of what is being assigned to.
        :type: NodeNG

        :param simple: Whether :attr:`target` is a pure name
            or a complex statement.
        :type simple: int

        :param value: The value being assigned to the variables.
        :type: NodeNG or None