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Manage timeouts across multiple steps.
Args:
timeout: Time available in seconds or :obj:`None` if there is no limit.
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Calculate a timeout from a deadline.
Args:
raise_if_elapsed: Whether to raise :exc:`TimeoutError`
if the deadline lapsed.
Raises:
TimeoutError: If the deadline lapsed.
Returns:
Time left in seconds or :obj:`None` if there is no limit.
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