[New-bugs-announce] [issue40124] Clearer assertion error

[Phil]

New submission from Phil <philip.graham.jones at googlemail.com>:

https://discuss.python.org/t/assertionerror-asyncio-streams-in-drain-helper/3743/4

I recently came across this error, which I now know how to fix. I think the error can be clearer and I've a PR which I think does so.

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components: asyncio
messages: 365378
nosy: asvetlov, pgjones, yselivanov
priority: normal
severity: normal
status: open
title: Clearer assertion error
versions: Python 3.5, Python 3.6, Python 3.7, Python 3.8, Python 3.9

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<https://bugs.python.org/issue40124>
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