code: def open(cls, filename):
          
          file_info = cls.parse_remote(filename)
          blob_service = cls.connect(filename)
          return BlobHandle(blob_service=blob_service,
                            container=file_info.container,
                            blob=file_info.blob,
                            chunk_size=cls._BLOB_CHUNK_DATA_SIZE)
docs: Provide a handle-like object for streaming.