[New-bugs-announce] [issue22572] NoneType object is not iterable error when asyncio Server.close() called

[R. David Murray]

New submission from R. David Murray:

I'm writing a little web server using aiohttp.  I tried to write a unit test...since this is a client server situation I launched the asyncio program in a thread and did a urlopen from the main thread.  That all works fine...the problem is in the cleanup code.  When I try to stop the server I created via create_server, I get the error in the title.

I've attached a stripped down version of my attempted unit test.  It does require aiohttp...I'm not well enough versed in asyncio yet to rewrite it using more fundamental pieces.

I may be doing something stupid here, but it seems to me that even if I am close should not throw this error (the error implies that it is already shut down, so I'd think the close would be a no-op).

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components: asyncio
files: waiter_bug.py
messages: 228742
nosy: gvanrossum, haypo, r.david.murray, yselivanov
priority: normal
severity: normal
status: open
title: NoneType object is not iterable error when asyncio Server.close() called
type: behavior
versions: Python 3.4, Python 3.5
Added file: http://bugs.python.org/file36830/waiter_bug.py

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<http://bugs.python.org/issue22572>
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