Yury Selivanov added the comment:
> Will it cancel whole chain of depending futures in a RIGHT way ?
I was thinking about this:
def Future.set_exception(exc):
if isinstance(exc, asyncio.CancelledError):
return self._cancel(exc)
# here goes old code
def Future.cancel():
return self._cancel(asyncio.CancelledError())
Although now, that I'm looking at it, I don't like this idea, because setting
as exception is a different operation from cancelling a task/future, and we
shouldn't mix them. It's OK to set a CancelledError without cancelling. Also
this would be a backwards incompatible change.
So back to square one -- we can consider passing extra args to .cancel()
methods.
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<http://bugs.python.org/issue31033>
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