metaclass causes __dict__ to be dict

[jhylton]

BPO	642358
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 = 'https://github.com/gvanrossum'
closed_at = <Date 2003-01-07.13:43:34.000>
created_at = <Date 2002-11-22.16:18:34.000>
labels = ['interpreter-core']
title = 'metaclass causes __dict__ to be dict'
updated_at = <Date 2003-01-07.13:43:34.000>
user = 'https://bugs.python.org/jhylton'

bugs.python.org fields:

activity = <Date 2003-01-07.13:43:34.000>
actor = 'gvanrossum'
assignee = 'gvanrossum'
closed = True
closed_date = None
closer = None
components = ['Interpreter Core']
creation = <Date 2002-11-22.16:18:34.000>
creator = 'jhylton'
dependencies = []
files = []
hgrepos = []
issue_num = 642358
keywords = []
message_count = 4.0
messages = ['13427', '13428', '13429', '13430']
nosy_count = 2.0
nosy_names = ['gvanrossum', 'jhylton']
pr_nums = []
priority = 'critical'
resolution = 'fixed'
stage = None
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue642358'
versions = []

[jhylton]

class Meta(type):
    def __new__(meta, name, bases, dict):
        return super(Meta, name).__new__(meta, name,
bases, dict)

class AClass:
    __metaclass__ = Meta

print type(AClass.__dict__)

With 2.2.2, this prints dict-proxy.
With 2.3, this prints dict.

As you noted, it should always be a dict-proxy to
prevent people from getting the __dict__ and the tp
slots out of sync.

[gvanrossum]

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user_id=6380

I should address this next, since it apparently causes Zope3
problems.

[gvanrossum]

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I think why this is. type_new() now always adds a __dict__
descriptor. Will have to be more subtle than that...

[gvanrossum]

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user_id=6380

This one was easy. Fixed as typeobject.c rev 2.202.