Accessing attr dict at definition time of a class from a metaclass results in changed type.

[archardlias]

BPO	18254
Nosy	@birkenfeld
Files	bugreport_cpython3.2.3.py: Failed Test Case

^{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 2013-10-14.14:27:51.148>
created_at = <Date 2013-06-18.10:21:45.764>
labels = ['interpreter-core']
title = 'Accessing attr dict at definition time of a class from a metaclass results in changed type.'
updated_at = <Date 2013-10-14.14:27:51.146>
user = 'https://bugs.python.org/archardlias'

bugs.python.org fields:

activity = <Date 2013-10-14.14:27:51.146>
actor = 'georg.brandl'
assignee = 'none'
closed = True
closed_date = <Date 2013-10-14.14:27:51.148>
closer = 'georg.brandl'
components = ['Interpreter Core']
creation = <Date 2013-06-18.10:21:45.764>
creator = 'archardlias'
dependencies = []
files = ['30636']
hgrepos = []
issue_num = 18254
keywords = []
message_count = 2.0
messages = ['191394', '199896']
nosy_count = 2.0
nosy_names = ['georg.brandl', 'archardlias']
pr_nums = []
priority = 'normal'
resolution = 'out of date'
stage = None
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue18254'
versions = ['Python 3.2']

[archardlias]

Accessing (just iterating or accessing in any way) the dict_proxy to the attribute dictionary in the MessageMeta metaclass, results in a change of "type" in any metaclass inheriting class definitions.

Reproducible in CPython versions (tested so far):
3.2.2
3.2.3

Works as of, or at least behaves as I subjectively intended to use it (only version tested)
3.3.2

[birkenfeld]

Only affects 3.2, so this won't be fixed anymore.