User code should not be able to rebind gc.garbage

[pitrou]

BPO	9505
Nosy	@tim-one, @pitrou

^{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 2010-08-04.15:08:01.105>
created_at = <Date 2010-08-04.10:25:14.781>
labels = ['easy', 'type-bug', 'library']
title = 'User code should not be able to rebind gc.garbage'
updated_at = <Date 2010-08-04.15:08:01.104>
user = 'https://github.com/pitrou'

bugs.python.org fields:

activity = <Date 2010-08-04.15:08:01.104>
actor = 'pitrou'
assignee = 'none'
closed = True
closed_date = <Date 2010-08-04.15:08:01.105>
closer = 'pitrou'
components = ['Library (Lib)']
creation = <Date 2010-08-04.10:25:14.781>
creator = 'pitrou'
dependencies = []
files = []
hgrepos = []
issue_num = 9505
keywords = ['easy']
message_count = 2.0
messages = ['112785', '112818']
nosy_count = 2.0
nosy_names = ['tim.peters', 'pitrou']
pr_nums = []
priority = 'normal'
resolution = 'rejected'
stage = 'needs patch'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue9505'
versions = ['Python 3.2']

[pitrou]

User code is currently allowed to rebind the gc.garbage attribute, while the "real" garbage list in the GC module actually remains the same. This is counter-intuitive and allows to write apparently correct code such as:

    gc.garbage = []

while it should really be:

gc.garbage[:] = []

[pitrou]

Hmm, I was under the impression that C extensions could set properties (or special members) on modules, but they can't. This makes this issue too hard to solve compared to the expected benefit.