def postinit(self, key=None, value=None, generators=None):
self.key = key<EOL>self.value = value<EOL>if generators is None:<EOL><INDENT>self.generators = []<EOL><DEDENT>else:<EOL><INDENT>self.generators = generators<EOL><DEDENT>
Do some setup after initialisation.

        :param key: What produces the keys.
        :type key: NodeNG or None

        :param value: What produces the values.
        :type value: NodeNG or None

        :param generators: The generators that are looped through.
        :type generators: list(Comprehension) or None