regression: BaseEventLoop.create_server does not accept port=None

[mcobden]

BPO	27415
Nosy	@gvanrossum, @vstinner, @berkerpeksag, @1st1

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2016-09-16.10:37:57.710>
created_at = <Date 2016-06-29.14:46:01.010>
labels = ['type-bug', 'expert-asyncio']
title = 'regression: BaseEventLoop.create_server does not accept port=None'
updated_at = <Date 2016-09-16.10:43:58.801>
user = 'https://bugs.python.org/mcobden'

bugs.python.org fields:

activity = <Date 2016-09-16.10:43:58.801>
actor = 'mcobden'
assignee = 'none'
closed = True
closed_date = <Date 2016-09-16.10:37:57.710>
closer = 'berker.peksag'
components = ['asyncio']
creation = <Date 2016-06-29.14:46:01.010>
creator = 'mcobden'
dependencies = []
files = []
hgrepos = []
issue_num = 27415
keywords = []
message_count = 6.0
messages = ['269507', '269619', '276627', '276690', '276691', '276692']
nosy_count = 5.0
nosy_names = ['gvanrossum', 'vstinner', 'berker.peksag', 'yselivanov', 'mcobden']
pr_nums = []
priority = 'normal'
resolution = 'out of date'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue27415'
versions = ['Python 3.4', 'Python 3.5']

[mcobden]

With the most recent 3.4 bugfix, calling create_server with port=None stopped working.
This also affects 3.5, and I would imagine also 3.6, but haven't checked that.

Test case:

import asyncio; l = asyncio.get_event_loop(); l.run_until_complete(l.create_server(lambda: None, host='0.0.0.0', port=None))

Expected result: a socket object
Broken result: "TypeError: an integer is required (got type NoneType)"

[mcobden]

I should add that port=0 is an acceptable workaround

[1st1]

Looks like this is fixed now.

[mcobden]

Still doesn't work in Python 3.4.5; I can confirm it's fixed in Python 3.5.2.

[berkerpeksag]

3.4 is in security-fix-only mode so it doesn't get bugfix updates anymore.

[mcobden]

Ah thanks, that's fair.
It seems a shame since this regression was introduced to 3.4 by a security/bugfix release.
Since there's a workaround it's not a big deal.