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� | j j | � Wd QXqLWXd S)an An iterator over the given futures that yields each as it completes.
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An iterator that yields the given Futures as they complete (finished or
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once.
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| j � t | t | � | � S)a Wait for the futures in the given sequence to complete.
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return_when: Indicates when this function should return. The options
are:
FIRST_COMPLETED - Return when any future finishes or is
cancelled.
FIRST_EXCEPTION - Return when any future finishes by raising an
exception. If no future raises an exception
then it is equivalent to ALL_COMPLETED.
ALL_COMPLETED - Return when all futures finish or are cancelled.
Returns:
A named 2-tuple of sets. The first set, named 'done', contains the
futures that completed (is finished or cancelled) before the wait
completed. The second set, named 'not_done', contains uncompleted
futures.
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