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cancelled, this returns an empty list. If the coroutine was
terminated by an exception, this returns the list of traceback
frames.
The frames are always ordered from oldest to newest.
The optional limit gives the maximum number of frames to
return; by default all available frames are returned. Its
meaning differs depending on whether a stack or a traceback is
returned: the newest frames of a stack are returned, but the
oldest frames of a traceback are returned. (This matches the
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)r Z_task_get_stack)rG r[ r" r" r# get_stack s zTask.get_stack)r[ filec C s t | ||S )an Print the stack or traceback for this task's coroutine.
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to which the output is written; by default output is written
to sys.stderr.
)r Z_task_print_stack)rG r[ r] r" r" r# print_stack s zTask.print_stackc C s> d| _ | r dS | jdur| jj|drdS d| _|| _dS )a Request that this task cancel itself.
This arranges for a CancelledError to be thrown into the
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The coroutine then has a chance to clean up or even deny
the request using try/except/finally.
Unlike Future.cancel, this does not guarantee that the
task will be cancelled: the exception might be caught and
acted upon, delaying cancellation of the task or preventing
cancellation completely. The task may also return a value or
raise a different exception.
Immediately after this method is called, Task.cancelled() will
not return True (unless the task was already cancelled). A
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terminates with a CancelledError exception (even if cancel()
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FNmsgT)Z_log_tracebackr% r@ cancelr? _cancel_message)rG r` r" r" r# ra s
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| d } w )Nz_step(): already done: z, Fr_ _asyncio_future_blockingzTask z got Future z attached to a different loopr4 z Task cannot await on itself: z-yield was used instead of yield from in task z with z;yield was used instead of yield from for generator in task zTask got bad yield: )%r% r ZInvalidStateErrorr?
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"Wr )r1 c C s t }|| }t|| |S )z]Schedule the execution of a coroutine object in a spawn task.
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| D } t| || I d H S ) a Wait for the Futures and coroutines given by fs to complete.
The fs iterable must not be empty.
Coroutines will be wrapped in Tasks.
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done, pending = await asyncio.wait(fs)
Note: This does not raise TimeoutError! Futures that aren't done
when the timeout occurs are returned in the second set.
z expect a list of futures, not z#Set of coroutines/Futures is empty.zInvalid return_when value: c s s | ]}t |V qd S r- )r r9 r& fr" r" r# x s zwait..zThe explicit passing of coroutine objects to asyncio.wait() is deprecated since Python 3.8, and scheduled for removal in Python 3.11.
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| W W | S tjy } zt |d}~ww | w )a Wait for the single Future or coroutine to complete, with timeout.
Coroutine will be wrapped in Task.
Returns result of the Future or coroutine. When a timeout occurs,
it cancels the task and raises TimeoutError. To avoid the task
cancellation, wrap it in shield().
If the wait is cancelled, the task is also cancelled.
This function is a coroutine.
Nr r )r r r r% rV _cancel_and_waitr re TimeoutError
create_future
call_laterr functoolspartialrn ra remove_done_callback)futr{ r! rq r timeout_handlecbr" r" r# r sX
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s | d|dur||tt| fdd}| D ]}|| q!zI dH W dur8 | D ]}|| q:ndurK | D ]}|| qMw t t }}| D ]}| rk| | q_| | q_||fS )zVInternal helper for wait().
The fs argument must be a collection of Futures.
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expression (which Task.__step knows how to handle)
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Nr" r" r" r" r# __sleep0E s
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r r c C s t | |dS )zmWrap a coroutine or an awaitable in a future.
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N) __await__)Z awaitabler" r" r# r s r c s* e Zd ZdZ fddZdddZ ZS )_GatheringFuturezHelper for gather().
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|dS )a Return a future aggregating results from the given coroutines/futures.
Coroutines will be wrapped in a future and scheduled in the event
loop. They will not necessarily be scheduled in the same order as
passed in.
All futures must share the same event loop. If all the tasks are
done successfully, the returned future's result is the list of
results (in the order of the original sequence, not necessarily
the order of results arrival). If *return_exceptions* is True,
exceptions in the tasks are treated the same as successful
results, and gathered in the result list; otherwise, the first
raised exception will be immediately propagated to the returned
future.
Cancellation: if the outer Future is cancelled, all children (that
have not completed yet) are also cancelled. If any child is
cancelled, this is treated as if it raised CancelledError --
the outer Future is *not* cancelled in this case. (This is to
prevent the cancellation of one child to cause other children to
be cancelled.)
If *return_exceptions* is False, cancelling gather() after it
has been marked done won't cancel any submitted awaitables.
For instance, gather can be marked done after propagating an
exception to the caller, therefore, calling ``gather.cancel()``
after catching an exception (raised by one of the awaitables) from
gather won't cancel any other awaitables.
c s d7 d u s r| s| d S s6| r'| }| d S | }|d ur6| d S kryg } D ]%} | rRt| jd u rMdn| j}n | }|d u r^| }| | q>j
rr| }| d S | d S d S )Nr ) r% r rY rf rZ r re rb rV appendr rW )r rq Zresultsresr Z nfinishedZnfutsouterr r" r# _done_callback s>
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S t}| fdd fdd} | S )a Wait for a future, shielding it from cancellation.
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task = asyncio.create_task(something())
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is exactly equivalent to the statement
res = await something()
*except* that if the coroutine containing it is cancelled, the
task running in something() is not cancelled. From the POV of
something(), the cancellation did not happen. But its caller is
still cancelled, so the yield-from expression still raises
CancelledError. Note: If something() is cancelled by other means
this will still cancel shield().
If you want to completely ignore cancellation (not recommended)
you can combine shield() with a try/except clause, as follows:
task = asyncio.create_task(something())
try:
res = await shield(task)
except CancelledError:
res = None
Save a reference to tasks passed to this function, to avoid
a task disappearing mid-execution. The event loop only keeps
weak references to tasks. A task that isn't referenced elsewhere
may get garbage collected at any time, even before it's done.
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r c s: t s tdtj fdd}| S )zsSubmit a coroutine object to a given event loop.
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