[issue32528] Change base class for futures.CancelledError

[Andrew Svetlov]

Andrew Svetlov <andrew.svetlov at gmail.com> added the comment:

Inheritance from Exception is very annoying, I saw issues with unexpected suppressing CancelledError many times.

Even experienced people constantly forget to add a separate `except asyncio.CancelledError` clause everywhere.

But proposed change is backward incompatible, sure.

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