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returned: the newest frames of a stack are returned, but the
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)r Z_task_print_stack)rC rN rP r r r print_stack s zTask.print_stackc C s4 d| _ | rdS | jdk r*| j r*dS d| _dS )a Request that this task cancel itself.
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Unlike Future.cancel, this does not guarantee that the
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Immediately after this method is called, Task.cancelled() will
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|}| j j| j|| jd W d t | j | d } X d S )Nz_step(): already done: z, F_asyncio_future_blockingzTask z got Future z attached to a different loop)r4 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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!Tr c C s t }|| S )z]Schedule the execution of a coroutine object in a spawn task.
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| D } t| || I dH S )a Wait for the Futures and coroutines given by fs to complete.
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r | | | Y nX | r| S | | t| |dI dH t W d| X dS )a Wait for the single Future or coroutine to complete, with timeout.
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Nc sZ d8 dks4t ks4tkrV| sV| d k rVd k rD sVd d S )Nr r )r r cancelledrL rR r" rK )rk )counterrj r} rr r r _on_completion s z _wait.._on_completion)
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| |dS tddS )zmWrap a coroutine or an awaitable in a future.
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N) __await__)Z awaitabler r r r o s r c s. e Zd ZdZdd fdd
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| dS )a0 Return a future aggregating results from the given coroutines/futures.
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loop. They will not necessarily be scheduled in the same order as
passed in.
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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.)
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c s\ t | |d rS t}| fdd fdd} | S )a. Wait for a future, shielding it from cancellation.
The statement
res = await shield(something())
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:
try:
res = await shield(something())
except CancelledError:
res = None
)r c s\ r | s| d S | r. n*| }|d k rJ | n | d S )N)r rL rR rM rK rJ )innerr` )r r r _inner_done_callback# s
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