def __init__(self, store, label_store, prefix=''):
        self.store = store
        self.label_store = label_store
        self.prefix = prefix.encode('utf-8')
Return sorted list of all package namespaces
dataset/ETHPy150Open dossier/dossier.web/dossier/web/label_folders.py/Folders.__init__--crossover with--dataset/ETHPy150Open chalasr/Flask-P2P/venv/lib/python2.7/site-packages/setuptools/command/install_egg_info.py/install_egg_info._get_all_ns_packages