Message 321527 - Python tracker

Message321527

Author	methane
Recipients	benjamin.peterson, methane, serhiy.storchaka, vstinner
Date	2018-07-12.08:31:29
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<CAEfz+Ty4Z6N-x-JVN1htCOEF2gMbH_a9bYXRXd_8qiNpAxkf9w@mail.gmail.com>
In-reply-to	<1531382440.99.0.56676864532.issue34093@psf.upfronthosting.co.za>

Content
> STINNER Victor <vstinner@redhat.com> added the comment: > > According to Serhiy Storchaka, currently marshal.dumps() writes frozenset in arbitrary order, and so frozenset serialization is not reproducible: > https://mail.python.org/pipermail/python-dev/2018-July/154604.html PYTHONHASHSEED can be used to stable frozenset order. On the other hand, refcnt based approach is more unstable. Even when x is y, dumps(x) == dumps(y) is not guaranteed.

Content

> STINNER Victor <vstinner@redhat.com> added the comment:
>
> According to Serhiy Storchaka, currently marshal.dumps() writes frozenset in arbitrary order, and so frozenset serialization is not reproducible:
> https://mail.python.org/pipermail/python-dev/2018-July/154604.html

PYTHONHASHSEED can be used to stable frozenset order.

On the other hand, refcnt based approach is more unstable.
Even when x is y, dumps(x) == dumps(y) is not guaranteed.

History
Date	User	Action	Args
2018-07-12 08:31:29	methane	set	recipients: + methane, vstinner, benjamin.peterson, serhiy.storchaka
2018-07-12 08:31:29	methane	link	issue34093 messages
2018-07-12 08:31:29	methane	create