deepcopy can't copy self-referential new-style classes

[scp93ch]

BPO	702858
Nosy	@gvanrossum

^{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 2003-06-13.19:27:38.000>
created_at = <Date 2003-03-13.10:14:29.000>
labels = ['interpreter-core']
title = "deepcopy can't copy self-referential new-style classes"
updated_at = <Date 2003-06-13.19:27:38.000>
user = 'https://bugs.python.org/scp93ch'

bugs.python.org fields:

activity = <Date 2003-06-13.19:27:38.000>
actor = 'gvanrossum'
assignee = 'none'
closed = True
closed_date = None
closer = None
components = ['Interpreter Core']
creation = <Date 2003-03-13.10:14:29.000>
creator = 'scp93ch'
dependencies = []
files = []
hgrepos = []
issue_num = 702858
keywords = []
message_count = 3.0
messages = ['15117', '15118', '15119']
nosy_count = 3.0
nosy_names = ['gvanrossum', 'staschuk', 'scp93ch']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue702858'
versions = ['Python 2.3']

[scp93ch]

Given this code:

import copy
class Foo(object):
    pass
f = Foo()
f.bar = f
g = copy.deepcopy(f)

You will find with Python 2.3a2 and 2.2.2:

f is f.bar -> True
g is g.bar -> False
g is not f -> True
g.bar is not f -> True

Obviously, all the statements should be True.

[staschuk]

Logged In: YES
user_id=666873

See patch 707900.

http://www.python.org/sf/707900

[gvanrossum]

Logged In: YES
user_id=6380

Fixed using that patch.