[issue32610] asyncio.all_tasks() should return only non-finished tasks.

[Yury Selivanov]

Yury Selivanov <yselivanov at gmail.com> added the comment:

I agree, returning done tasks is pretty useless.

This is a new function so let's fix its behavour.  We need to:

1. Document this difference between new asyncio.all_tasks() and now deprecated Task.all_tasks().

2. Make sure that Task.all_tasks() works in 3.7 in the same way it was working before 3.7.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue32610>
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