sys.exc_{type,values,traceback} needs a 2to3 fixer

[brettcannon]

BPO	2357
Nosy	@brettcannon, @birkenfeld, @jackdied, @benjaminp
Files	empty-arglist.diff: diff against 61574 issue2357.diff: diff against 61574

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

Show more details

GitHub fields:

assignee = None
closed_at = <Date 2008-08-21.23:45:22.961>
created_at = <Date 2008-03-17.19:38:46.383>
labels = ['type-bug', 'expert-2to3', 'release-blocker']
title = 'sys.exc_{type,values,traceback} needs a 2to3 fixer'
updated_at = <Date 2008-08-21.23:45:22.960>
user = 'https://github.com/brettcannon'

bugs.python.org fields:

activity = <Date 2008-08-21.23:45:22.960>
actor = 'benjamin.peterson'
assignee = 'collinwinter'
closed = True
closed_date = <Date 2008-08-21.23:45:22.961>
closer = 'benjamin.peterson'
components = ['2to3 (2.x to 3.x conversion tool)']
creation = <Date 2008-03-17.19:38:46.383>
creator = 'brett.cannon'
dependencies = []
files = ['9748', '9749']
hgrepos = []
issue_num = 2357
keywords = ['patch', '26backport', 'needs review']
message_count = 10.0
messages = ['63732', '63747', '64012', '64013', '64082', '64463', '64464', '64469', '70465', '71703']
nosy_count = 6.0
nosy_names = ['brett.cannon', 'georg.brandl', 'collinwinter', 'jackdied', 'benjamin.peterson', 'jeff.balogh']
pr_nums = []
priority = 'release blocker'
resolution = 'fixed'
stage = None
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue2357'
versions = ['Python 2.6']

[brettcannon]

Using sys.exc_{type,values,traceback} should raise a Py3K warning.

[brettcannon]

A fixer to use sys.exc_info is needed.

[jeffbalogh]

Attaching a helper patch that allows an empty ArgList in lib2to3/fixes/
util.py, which is required by my next patch.

[jeffbalogh]

Attaching a patch that provides fixers for sys.exc_
{type,value,traceback}

[jackdied]

Fixer patch works for me (both must be applied).

A 3k warning for accessing is harder - it would have to copy the module
type or dict type and supply a custom to_getattro that watches for
accesses to exc_(type|values|traceback). I'll look into it.

[birkenfeld]

I'd say that since this is so easy for a fixer to spot and fix, no
convoluted effort to add a Py3k warning is necessary. (The same goes
for sys.exitfunc, bpo-2356).

[brettcannon]

I agree with Georg; a 2to3 fixer is enough.

[jackdied]

+1, I'll burn my _apply_evil(ModuleObject *) function patch to
moduleobject.c which did a memcpy on a type object and several other
heresies.

On Tue, Mar 25, 2008 at 4:27 AM, Brett Cannon <report@bugs.python.org> wrote:

Brett Cannon <brett@python.org> added the comment:

I agree with Georg; a 2to3 fixer is enough.

---

Tracker <report@bugs.python.org>
<http://bugs.python.org/issue2357\>

---

[benjaminp]

Collin, can you review the 2to3 patch?