Review additions to the stable ABI of Python 3.4

[vstinner]

BPO	19526
Nosy	@loewis, @ncoghlan, @vstinner, @larryhastings

^{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 2014-01-04.10:32:11.067>
created_at = <Date 2013-11-08.11:18:15.515>
labels = ['release-blocker']
title = 'Review additions to the stable ABI of Python 3.4'
updated_at = <Date 2014-01-04.10:32:11.066>
user = 'https://github.com/vstinner'

bugs.python.org fields:

activity = <Date 2014-01-04.10:32:11.066>
actor = 'loewis'
assignee = 'none'
closed = True
closed_date = <Date 2014-01-04.10:32:11.067>
closer = 'loewis'
components = []
creation = <Date 2013-11-08.11:18:15.515>
creator = 'vstinner'
dependencies = []
files = []
hgrepos = []
issue_num = 19526
keywords = []
message_count = 5.0
messages = ['202412', '202413', '202416', '207245', '207246']
nosy_count = 5.0
nosy_names = ['loewis', 'ncoghlan', 'vstinner', 'larry', 'python-dev']
pr_nums = []
priority = 'release blocker'
resolution = 'fixed'
stage = None
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue19526'
versions = ['Python 3.4']

[vstinner]

Example:

http://hg.python.org/cpython/rev/69071054b42f
PyAPI_FUNC(int) _PyDict_DelItemId(PyObject *mp, struct _Py_Identifier *key);

New functions added in this issue should also be reviewed (should them be part of the stable ABI?):

http://bugs.python.org/issue11619
http://hg.python.org/cpython/rev/df2fdd42b375

[vstinner]

"Priority: release blocker" means that it should be done at least before Python 3.4 final. It may be delayed after the beta1.

[python-dev]

New changeset bf9c77bac36d by Victor Stinner in branch 'default':
Issue bpo-19512, bpo-19526: Exclude the new _PyDict_DelItemId() function from the
http://hg.python.org/cpython/rev/bf9c77bac36d

[python-dev]

New changeset 15bad3abfac9 by Martin v. Löwis in branch 'default':
Issue bpo-19526: Exclude all new API from the stable ABI.
http://hg.python.org/cpython/rev/15bad3abfac9

[loewis]

The procedure to obtain the new API was this:

• write a C file

#define Py_LIMITED_API
#include <Python.h>

• compile this with gcc -E | grep -v '#'

• diff and inspect the two preprocessor outputs. Ideally, they come out empty, but they currently show lots of (legitimate) const additions, and some reformattings