def listNamespaces(self, recursive=False, internal=False):
        curNS = Namespace.getCurrent()

        self.setCurrent()
        try:
            namespaces = map(self.__class__, cmds.namespaceInfo(listOnlyNamespaces=True) or [])

            if not internal:
                for i in [":UI",":shared"]:
                    if i in namespaces:
                        namespaces.remove(i)

            if recursive:
                childNamespaces = []
                for ns in namespaces:
                    childNamespaces.extend(ns.listNamespaces(recursive, internal))
                namespaces.extend(childNamespaces)
        finally:
            curNS.setCurrent()

        return namespaces
:reference: https://dev.twitter.com/docs/api/1.1/get/lists/subscribers/show
dataset/ETHPy150Open CountZer0/PipelineConstructionSet/python/maya/site-packages/pymel-1.0.3/pymel/core/system.py/Namespace.listNamespaces--crossover with--dataset/ETHPy150Open tweepy/tweepy/tweepy/api.py/API.show_list_subscriber