[issue31033] Add argument to .cancel() of Task and Future

[Yury Selivanov]

Yury Selivanov added the comment:

Well, don't use "print(e)" when you are printing errors in in Python. This is pretty standard behaviour for all Python code, not just asyncio. A lot of code in stdlib raises exceptions, almost none allows to customize them.

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<http://bugs.python.org/issue31033>
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