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� Zdd� Zdd� Zdd� Zdd� Zdd� Zdd�dd�ZzddlZW n ey� Y n0 ej ZZdS )z.A Future class similar to the one in PEP 3148.)�Future�wrap_future�isfuture� N)�GenericAlias� )�base_futures)�events)�
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Differences:
- This class is not thread-safe.
- result() and exception() do not take a timeout argument and
raise an exception when the future isn't done yet.
- Callbacks registered with add_done_callback() are always called
via the event loop's call_soon().
- This class is not compatible with the wait() and as_completed()
methods in the concurrent.futures package.
(In Python 3.4 or later we may be able to unify the implementations.)
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The optional event_loop argument allows explicitly setting the event
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