In reply to anjujoseph:
In reply to cgales:
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I read it in the above page in the cook book.
"Use start for sequences, start_item, finish_item for sequence_items
Sequence_items should be sent to the driver using the start_item() and finish_item() calls. Sequences should be started using the start() call.
Justification:
Although sequences can also be started using start_item() and finish_item(), it is clearer to the user whether a sequence or a sequence item is being processed if this convention is followed.
"