OrderedDict ref cycles break repr()

[jek]

BPO	9826
Nosy	@rhettinger, @merwok
Files	odictcyclerepr.py

^{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/rhettinger'
closed_at = <Date 2010-09-12.05:29:18.968>
created_at = <Date 2010-09-10.19:09:59.514>
labels = ['type-bug', 'library']
title = 'OrderedDict ref cycles break repr()'
updated_at = <Date 2010-09-12.05:29:18.966>
user = 'https://bugs.python.org/jek'

bugs.python.org fields:

activity = <Date 2010-09-12.05:29:18.966>
actor = 'rhettinger'
assignee = 'rhettinger'
closed = True
closed_date = <Date 2010-09-12.05:29:18.968>
closer = 'rhettinger'
components = ['Library (Lib)']
creation = <Date 2010-09-10.19:09:59.514>
creator = 'jek'
dependencies = []
files = ['18835']
hgrepos = []
issue_num = 9826
keywords = []
message_count = 3.0
messages = ['116037', '116038', '116150']
nosy_count = 3.0
nosy_names = ['rhettinger', 'jek', 'eric.araujo']
pr_nums = []
priority = 'low'
resolution = 'fixed'
stage = 'needs patch'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue9826'
versions = ['Python 3.1', 'Python 2.7', 'Python 3.2']

[jek]

repr of circular graphs of collections.OrderedDicts fails with 'RuntimeError: maximum recursion depth exceeded while calling a Python object'.

>>> from collections import OrderedDict
>>> left, right = OrderedDict(), OrderedDict()
>>> left['other'] = right
>>> right['other'] = left
>>> left
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  ...
  File "lib/python2.7/collections.py", line 137, in __repr__
    return '%s(%r)' % (self.__class__.__name__, self.items())
RuntimeError: maximum recursion depth exceeded in __subclasscheck__

[rhettinger]

Patch?

[rhettinger]

Fixed in r84728 and r84729.
Will backport to 2.7 shortly.