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This method takes an iterable of coroutine functions. The first one is
started immediately. From then on, whenever the immediately preceding one
fails (raises an exception), or when *delay* seconds has passed, the next
coroutine is started. This continues until one of the coroutines complete
successfully, in which case all others are cancelled, or until all
coroutines fail.
The coroutines provided should be well-behaved in the following way:
* They should only ``return`` if completed successfully.
* They should always raise an exception if they did not complete
successfully. In particular, if they handle cancellation, they should
probably reraise, like this::
try:
# do work
except asyncio.CancelledError:
# undo partially completed work
raise
Args:
coro_fns: an iterable of coroutine functions, i.e. callables that
return a coroutine object when called. Use ``functools.partial`` or
lambdas to pass arguments.
delay: amount of time, in seconds, between starting coroutines. If
``None``, the coroutines will run sequentially.
loop: the event loop to use.
Returns:
tuple *(winner_result, winner_index, exceptions)* where
- *winner_result*: the result of the winning coroutine, or ``None``
if no coroutines won.
- *winner_index*: the index of the winning coroutine in
``coro_fns``, or ``None`` if no coroutines won. If the winning
coroutine may return None on success, *winner_index* can be used
to definitively determine whether any coroutine won.
- *exceptions*: list of exceptions returned by the coroutines.
``len(exceptions)`` is equal to the number of coroutines actually
started, and the order is the same as in ``coro_fns``. The winning
coroutine's entry is ``None``.
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