(fs, *, timeout=None)
Return an iterator whose values are coroutines.

    When waiting for the yielded coroutines you'll get the results (or
    exceptions!) of the original Futures (or coroutines), in the order
    in which and as soon as they complete.

    This differs from PEP 3148; the proper way to use this is:

        for f in as_completed(fs):
            result = await f  # The 'await' may raise.
            # Use result.

    If a timeout is specified, the 'await' will raise
    TimeoutError when the timeout occurs before all Futures are done.

    Note: The futures 'f' are not necessarily members of fs.
Return an iterator whose values are coroutines.
Return an iterator whose values are coroutines .
def as_completed(fs, *, timeout=None):
    """Return an iterator whose values are coroutines.

    When waiting for the yielded coroutines you'll get the results (or
    exceptions!) of the original Futures (or coroutines), in the order
    in which and as soon as they complete.

    This differs from PEP 3148; the proper way to use this is:

        for f in as_completed(fs):
            result = await f  # The 'await' may raise.
            # Use result.

    If a timeout is specified, the 'await' will raise
    TimeoutError when the timeout occurs before all Futures are done.

    Note: The futures 'f' are not necessarily members of fs.
    """
    if futures.isfuture(fs) or coroutines.iscoroutine(fs):
        raise TypeError(f"expect an iterable of futures, not {type(fs).__name__}")

    from .queues import Queue  # Import here to avoid circular import problem.
    done = Queue()

    loop = events._get_event_loop()
    todo = {ensure_future(f, loop=loop) for f in set(fs)}
    timeout_handle = None

    def _on_timeout():
        for f in todo:
            f.remove_done_callback(_on_completion)
            done.put_nowait(None)  # Queue a dummy value for _wait_for_one().
        todo.clear()  # Can't do todo.remove(f) in the loop.

    def _on_completion(f):
        if not todo:
            return  # _on_timeout() was here first.
        todo.remove(f)
        done.put_nowait(f)
        if not todo and timeout_handle is not None:
            timeout_handle.cancel()

    async def _wait_for_one():
        f = await done.get()
        if f is None:
            # Dummy value from _on_timeout().
            raise exceptions.TimeoutError
        return f.result()  # May raise f.exception().

    for f in todo:
        f.add_done_callback(_on_completion)
    if todo and timeout is not None:
        timeout_handle = loop.call_later(timeout, _on_timeout)
    for _ in range(len(todo)):
        yield _wait_for_one()
def as_completed ( fs , * , timeout = None ) : if futures . isfuture ( fs ) or coroutines . iscoroutine ( fs ) : raise TypeError ( f"expect an iterable of futures, not {type(fs).__name__}" ) from . queues import Queue # Import here to avoid circular import problem. done = Queue ( ) loop = events . _get_event_loop ( ) todo = { ensure_future ( f , loop = loop ) for f in set ( fs ) } timeout_handle = None def _on_timeout ( ) : for f in todo : f . remove_done_callback ( _on_completion ) done . put_nowait ( None ) # Queue a dummy value for _wait_for_one(). todo . clear ( ) # Can't do todo.remove(f) in the loop. def _on_completion ( f ) : if not todo : return # _on_timeout() was here first. todo . remove ( f ) done . put_nowait ( f ) if not todo and timeout_handle is not None : timeout_handle . cancel ( ) async def _wait_for_one ( ) : f = await done . get ( ) if f is None : # Dummy value from _on_timeout(). raise exceptions . TimeoutError return f . result ( ) # May raise f.exception(). for f in todo : f . add_done_callback ( _on_completion ) if todo and timeout is not None : timeout_handle = loop . call_later ( timeout , _on_timeout ) for _ in range ( len ( todo ) ) : yield _wait_for_one ( )