dataclasses: disallow inheritance between frozen and non-frozen classes

[ericvsmith]

BPO	32960
Nosy	@ericvsmith
PRs	bpo-32960: dataclasses disallow frozen inheritance #5919 [3.7] bpo-32960: For dataclasses, disallow inheriting frozen from non-frozen classes and vice-versa, (GH-5919) #5920

^{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/ericvsmith'
closed_at = <Date 2018-03-19.01:29:30.902>
created_at = <Date 2018-02-26.23:41:26.157>
labels = ['3.7', '3.8', 'type-bug', 'library']
title = 'dataclasses: disallow inheritance between frozen and non-frozen classes'
updated_at = <Date 2018-03-19.01:29:30.896>
user = 'https://github.com/ericvsmith'

bugs.python.org fields:

activity = <Date 2018-03-19.01:29:30.896>
actor = 'eric.smith'
assignee = 'eric.smith'
closed = True
closed_date = <Date 2018-03-19.01:29:30.902>
closer = 'eric.smith'
components = ['Library (Lib)']
creation = <Date 2018-02-26.23:41:26.157>
creator = 'eric.smith'
dependencies = []
files = []
hgrepos = []
issue_num = 32960
keywords = ['patch']
message_count = 4.0
messages = ['312972', '312973', '312978', '314073']
nosy_count = 1.0
nosy_names = ['eric.smith']
pr_nums = ['5919', '5920']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue32960'
versions = ['Python 3.7', 'Python 3.8']

[ericvsmith]

This is a temporary measure until we can better define how frozen inheritance should work. In the meantime, disallow:

• frozen inherited from non-frozen
• non-frozen inherited from frozen

[ericvsmith]

See bpo-32953 for a larger discussion and the ultimate resolution of this.

[ericvsmith]

New changeset a93e3dc by Eric V. Smith (Miss Islington (bot)) in branch '3.7':
bpo-32960: For dataclasses, disallow inheriting frozen from non-frozen classes and vice-versa, (GH-5919) (GH-5920)
a93e3dc

[ericvsmith]

Resolved by bpo-32953.