def _listdirs(self, file):
            zf = zipfile.ZipFile(file)
            dirs = []
            for name in zf.namelist():
                    dn = os.path.dirname(name)
                    dirs.append(dn)
            dirs.sort()
            return dirs
Grabs all the directories in the zip structure
dataset/ETHPy150Open eBay/restcommander/play-1.2.4/framework/pym/play/commands/modulesrepo.py/Unzip._listdirs