Add private _PyErr_ReplaceException() in 2.7

[serhiy-storchaka]

BPO	23781
Nosy	@vstinner, @serhiy-storchaka
Files	capi_PyErr_ReplaceException.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/serhiy-storchaka'
closed_at = <Date 2015-03-30.07:04:19.727>
created_at = <Date 2015-03-26.09:49:48.117>
labels = ['interpreter-core', 'type-feature']
title = 'Add private _PyErr_ReplaceException() in 2.7'
updated_at = <Date 2015-03-30.07:04:19.727>
user = 'https://github.com/serhiy-storchaka'

bugs.python.org fields:

activity = <Date 2015-03-30.07:04:19.727>
actor = 'serhiy.storchaka'
assignee = 'serhiy.storchaka'
closed = True
closed_date = <Date 2015-03-30.07:04:19.727>
closer = 'serhiy.storchaka'
components = ['Interpreter Core']
creation = <Date 2015-03-26.09:49:48.117>
creator = 'serhiy.storchaka'
dependencies = []
files = ['38697']
hgrepos = []
issue_num = 23781
keywords = ['patch']
message_count = 3.0
messages = ['239317', '239318', '239574']
nosy_count = 3.0
nosy_names = ['vstinner', 'python-dev', 'serhiy.storchaka']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue23781'
versions = ['Python 2.7']

[serhiy-storchaka]

Proposed patch adds internal private function _PyErr_ReplaceException() in 2.7. This functions is like _PyErr_ChainExceptions() in 3.x, but doesn't set the context. It makes the code of 2.x simpler and more similar to 3.x and makes the backporting from 3.x easier.

[vstinner]

FIY I'm working on a draft of new PEP to chain exceptions at C level: PEP-490.

[python-dev]

New changeset c76a1a42799c by Serhiy Storchaka in branch '2.7':
Issue bpo-23781: Add private helper function _PyErr_ReplaceException() that
https://hg.python.org/cpython/rev/c76a1a42799c