def __init__(self, zip_file, shuffle=False):
        """
        Args:
            zip_file (list): list of zip file paths.
        """
        assert os.path.isfile(zip_file)
        self._file = zip_file
        self.shuffle = shuffle
        self.open()

        Args:
            zip_file (list): list of zip file paths.
        
examples/SuperResolution/data_sampler.py