Add 'oem' encoding

[zooba]

BPO	27959
Nosy	@pfmoore, @vstinner, @tjguk, @zware, @zooba
Files	27959_1.patch 27959_2.patch 27959_3.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 = 'https://github.com/zooba'
closed_at = <Date 2016-09-07.02:48:30.530>
created_at = <Date 2016-09-05.23:41:40.307>
labels = ['type-feature', 'OS-windows']
title = "Add 'oem' encoding"
updated_at = <Date 2016-09-09.15:58:00.280>
user = 'https://github.com/zooba'

bugs.python.org fields:

activity = <Date 2016-09-09.15:58:00.280>
actor = 'steve.dower'
assignee = 'steve.dower'
closed = True
closed_date = <Date 2016-09-07.02:48:30.530>
closer = 'steve.dower'
components = ['Windows']
creation = <Date 2016-09-05.23:41:40.307>
creator = 'steve.dower'
dependencies = []
files = ['44387', '44388', '44405']
hgrepos = []
issue_num = 27959
keywords = ['patch']
message_count = 12.0
messages = ['274470', '274471', '274482', '274487', '274491', '274645', '274714', '274716', '274719', '274832', '275323', '275324']
nosy_count = 6.0
nosy_names = ['paul.moore', 'vstinner', 'tim.golden', 'python-dev', 'zach.ware', 'steve.dower']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue27959'
versions = ['Python 3.6']

[zooba]

Currently the ANSI encoding is available on Windows as 'mbcs', however the OEM encoding (sometimes used by console-based applications) is not easily available.

The implementation is identical to PyUnicode_DecodeMBCS[Stateful], simply passing CP_OEM instead of CP_ACP.

[zooba]

While I'm here, should also move aliasmbcs from site.py into initialization - no reason for this behaviour to depend on importing site.

[zooba]

Initial patch attached - tests to follow.

[zooba]

Forgot to include the oem.py file in that patch, but it's basically identical to mbcs.py except calling 'oem_encode' and 'oem_decode'. It'll be in the next one

[zooba]

Addressed most of the feedback, though I think having a fallback search function instead of the alias is better.

[vstinner]

Rebased patch to get a review button.

[python-dev]

New changeset c499690f606c by Steve Dower in branch 'default':
Issue bpo-27959: Adds oem encoding, alias ansi to mbcs, move aliasmbcs to codec lookup
https://hg.python.org/cpython/rev/c499690f606c

[python-dev]

New changeset fd0e62300fb7 by Steve Dower in branch 'default':
Issue bpo-27959: Documents new encoding and alias.
https://hg.python.org/cpython/rev/fd0e62300fb7

[python-dev]

New changeset 786c34bdc27a by Steve Dower in branch 'default':
Issue bpo-27959: Updates NEWS and whatsnew
https://hg.python.org/cpython/rev/786c34bdc27a

[python-dev]

New changeset 47b4dbd451f5 by Steve Dower in branch 'default':
Issue bpo-27959: Prevent ImportError from escaping codec search function
https://hg.python.org/cpython/rev/47b4dbd451f5

[python-dev]

New changeset 4e80a157ea66 by Steve Dower in branch 'default':
Revert bpo-27959: ImportError within an encoding module should also skip the encoding
https://hg.python.org/cpython/rev/4e80a157ea66