Патерн Фасад

class Archive:
    def __init__(self, filename):
        self._names = None
        self._unpack = None
        self._file = None
        self.filename = filename
    @property
    def filename(self):
        return self.__filename
    @filename.setter
    def filename(self, name):
        self.close()
        self.__filename = name
    def close(self):
        print('1')
        if self._file is not None:
            self._file.close()
        self._names = self._unpack = self._file = None
    def __enter__(self):
        return self
    def __exit__(self, exc_type, exc_value, traceback):
        print('Error - %s' % traceback)
        self.close()
    def names(self):
        if self._file is None:
            self._prepare()
        return self._names()