[issue32528] Change base class for futures.CancelledError

[Марк Коренберг]

Марк Коренберг <socketpair at gmail.com> added the comment:

Will you accept PR if I fix that ?

I think we may merge that in Python 3.8

Who can also judge us? @asvetlov, what do you think about my idea ?

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