[issue32528] Change base class for futures.CancelledError

[Joongi Kim]

Joongi Kim <me at daybreaker.info> added the comment:

I strongly agree to have discretion of CancelledError and other general exceptions, though I don't have concrete ideas on good unobtrusive ways to achieve this.

If I write my codes carefully I could control most of cancellation explicitly, but it is still hard to control it in 3rd-party libraries that I depend on. Often they just raise random errors, or CancelledError is swallowed.

Also it would be nice to have some documentation and examples on how to write "cancellation-friendly" coroutine codes.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue32528>
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