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� | j j | � Wd QRXqHWXd S)an An iterator over the given futures that yields each as it completes.
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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
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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
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N)�NotImplementedError)r r^ r8 �kwargsr r r �submit s zExecutor.submitrJ N� chunksizer- c s] � d k r � t j � � � � f d d � t | � D� � � � � f d d � } | � S)a} Returns an iterator equivalent to map(fn, iter).
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