Backport intern() -> sys.intern()

[brettcannon]

BPO	2339
Nosy	@gvanrossum, @brettcannon, @rhettinger, @benjaminp
Files	backport_sys_intern.patch: Backports sys.intern

^{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/gvanrossum'
closed_at = <Date 2008-03-17.23:45:47.165>
created_at = <Date 2008-03-17.17:55:48.365>
labels = ['interpreter-core']
title = 'Backport intern() -> sys.intern()'
updated_at = <Date 2008-03-17.23:45:47.163>
user = 'https://github.com/brettcannon'

bugs.python.org fields:

activity = <Date 2008-03-17.23:45:47.163>
actor = 'rhettinger'
assignee = 'gvanrossum'
closed = True
closed_date = <Date 2008-03-17.23:45:47.165>
closer = 'rhettinger'
components = ['Interpreter Core']
creation = <Date 2008-03-17.17:55:48.365>
creator = 'brett.cannon'
dependencies = []
files = ['9698']
hgrepos = []
issue_num = 2339
keywords = ['patch', '26backport']
message_count = 5.0
messages = ['63698', '63750', '63786', '63806', '63807']
nosy_count = 4.0
nosy_names = ['gvanrossum', 'brett.cannon', 'rhettinger', 'benjamin.peterson']
pr_nums = []
priority = 'low'
resolution = 'rejected'
stage = None
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue2339'
versions = ['Python 2.6']

[brettcannon]

intern() needs to be added as sys.intern(). Then a 2to3 fixer needs to
be written.

[benjaminp]

Here's a patch which moves intern to sysmodule.c, adds a Py3k warning,
updates the docs, and moves the tests.

[rhettinger]

Guido, do you want this alias in Py2.6?

Seems like it should just be a 2-to-3 fixer issue only.

Also, I vaguely remembered that we weren't going to expose interning at
all. There was a discussion on python-dev a couple years ago where I
believe that we concluded that this is primarily an internal
optimization and that almost no pure python programs benefitted from
calling intern() directly. IOW, I thought this was dead as a public API.

[gvanrossum]

I see no great advantage in having it backported, though I also don't
see no great harm.

Since we still use interning as an internal speed-up, I believe in
exposing the API, past discussions notwithstanding.

[rhettinger]

Okay thanks. Closing this one as something that isn't really needed.