weakref should have a WeakSet

[leorochael]

BPO	985753
Nosy	@rhettinger

^{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 2004-07-10.23:58:04.000>
created_at = <Date 2004-07-06.06:42:00.000>
labels = ['library']
title = 'weakref should have a WeakSet'
updated_at = <Date 2004-07-10.23:58:04.000>
user = 'https://bugs.python.org/leorochael'

bugs.python.org fields:

activity = <Date 2004-07-10.23:58:04.000>
actor = 'rhettinger'
assignee = 'none'
closed = True
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2004-07-06.06:42:00.000>
creator = 'leorochael'
dependencies = []
files = []
hgrepos = []
issue_num = 985753
keywords = []
message_count = 3.0
messages = ['21424', '21425', '21426']
nosy_count = 2.0
nosy_names = ['rhettinger', 'leorochael']
pr_nums = []
priority = 'normal'
resolution = 'wont fix'
stage = None
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue985753'
versions = []

[leorochael]

It'd be nice if weakref had a WeakSet. This way I
wouldn't need a WeakValueDictionary keyed by id(object)
when all I want is to iterate over the objects that are
still alive.

[rhettinger]

Logged In: YES
user_id=80475

Why not use a WeakKeyDictionary with the values set to True?

[rhettinger]

Logged In: YES
user_id=80475

Closing this as won't fix.

The WeakKeyDictionary and fromkeys() method meet this need
easily:

alive = WeakKeyDictionary.fromkeys(*objlist)
  . . .
print list(alive)    # always current list of alive objects