Extension modules with single-letter names can't be loaded

[encukou]

BPO	24328
Nosy	@brettcannon, @ncoghlan, @encukou, @ericsnowcurrently, @vadmium
Files	fix-short-names.patch

^{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 2015-05-29.22:11:53.968>
created_at = <Date 2015-05-29.19:49:52.190>
labels = ['type-bug', 'release-blocker']
title = "Extension modules with single-letter names can't be loaded"
updated_at = <Date 2015-05-29.23:44:58.127>
user = 'https://github.com/encukou'

bugs.python.org fields:

activity = <Date 2015-05-29.23:44:58.127>
actor = 'python-dev'
assignee = 'none'
closed = True
closed_date = <Date 2015-05-29.22:11:53.968>
closer = 'python-dev'
components = []
creation = <Date 2015-05-29.19:49:52.190>
creator = 'petr.viktorin'
dependencies = []
files = ['39554']
hgrepos = []
issue_num = 24328
keywords = ['patch']
message_count = 4.0
messages = ['244403', '244424', '244430', '244431']
nosy_count = 6.0
nosy_names = ['brett.cannon', 'ncoghlan', 'petr.viktorin', 'python-dev', 'eric.snow', 'martin.panter']
pr_nums = []
priority = 'release blocker'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue24328'
versions = ['Python 3.5', 'Python 3.6']

[encukou]

A regression in the PEP-489 implementation prevents loading extension modules with single-character names (because length-1 bytestrings are interned).

Here is a fix. It would be great to have it in 3.5.0b2.

[python-dev]

New changeset 784f372d701a by Benjamin Peterson in branch '3.5':
fix importing one char extension modules (closes bpo-24328)
https://hg.python.org/cpython/rev/784f372d701a

New changeset d89bab1f160e by Benjamin Peterson in branch 'default':
merge 3.5 (bpo-24328)
https://hg.python.org/cpython/rev/d89bab1f160e

[vadmium]

Two minor comments on Reitveld. Looks like you alreay fixed one of them in the actual commit.

[python-dev]

New changeset 8428cb297d15 by Benjamin Peterson in branch '3.5':
use assert method (bpo-24328)
https://hg.python.org/cpython/rev/8428cb297d15