cloudvolume.py 文件源码

def exists(self, bbox_or_slices):
    """
    Produce a summary of whether all the requested chunks exist.

    bbox_or_slices: accepts either a Bbox or a tuple of slices representing
      the requested volume. 
    Returns: { chunk_file_name: boolean, ... }
    """
    if type(bbox_or_slices) is Bbox:
      requested_bbox = bbox_or_slices
    else:
      (requested_bbox, steps, channel_slice) = self.__interpret_slices(bbox_or_slices)
    realized_bbox = self.__realized_bbox(requested_bbox)
    cloudpaths = self.__chunknames(realized_bbox, self.bounds, self.key, self.underlying)

    with Storage(self.layer_cloudpath, progress=self.progress) as storage:
      existence_report = storage.files_exist(cloudpaths)
    return existence_report