[New-bugs-announce] [issue36119] Can't add/append in set/list inside shared dict

[Andrei Stefan]

New submission from Andrei Stefan <stefan.catalinandrei at yahoo.com>:

I'm creating a shared dict for multiprocessing purposes:

from multiprocessing import Manager

manager = Manager()
shared_dict = manager.dict()

If I add a set or a list as a value in the dict:
shared_dict['test'] = set() or shared_dict['test'] = list()

I can't add/append in that set/list inside the shared dictionary:
shared_dict['test'].add(1234) or shared_dict['test'].append(1234)

The following expression:
print(dict(shared_dict))

Will return:
{'test': set()} or {'test': []}.

But if I add in the set/list using operators:
shared_dict['test'] |= {1234} or shared_dict['test'] += [1234]

It will work:
{'test': {1234}} or {'test': [1234]}.

----------
components: Build
files: image (2).png
messages: 336642
nosy: andrei2peu
priority: normal
severity: normal
status: open
title: Can't add/append in set/list inside shared dict
type: behavior
versions: Python 3.6
Added file: https://bugs.python.org/file48171/image (2).png

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36119>
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