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dataclasses: it should be an error to specify KW_ONLY twice #88181

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ericvsmith opened this issue May 3, 2021 · 2 comments
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dataclasses: it should be an error to specify KW_ONLY twice #88181

ericvsmith opened this issue May 3, 2021 · 2 comments
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3.10 only security fixes stdlib Python modules in the Lib dir type-bug An unexpected behavior, bug, or error

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BPO 44015
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  • bpo-44015: dataclasses should allow KW_ONLY to be specified only once per class #25841
    		•

    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 2021-05-03.07:26:01.594>
created_at = <Date 2021-05-03.06:09:50.431>
labels = ['type-bug', 'library', '3.10']
title = 'dataclasses: it should be an error to specify KW_ONLY twice'
updated_at = <Date 2021-05-03.07:26:01.594>
user = 'https://github.com/ericvsmith'

    bugs.python.org fields:

    activity = <Date 2021-05-03.07:26:01.594>
actor = 'eric.smith'
assignee = 'eric.smith'
closed = True
closed_date = <Date 2021-05-03.07:26:01.594>
closer = 'eric.smith'
components = ['Library (Lib)']
creation = <Date 2021-05-03.06:09:50.431>
creator = 'eric.smith'
dependencies = []
files = []
hgrepos = []
issue_num = 44015
keywords = ['patch']
message_count = 2.0
messages = ['392768', '392772']
nosy_count = 1.0
nosy_names = ['eric.smith']
pr_nums = ['25841']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue44015'
versions = ['Python 3.10']
    @ericvsmith
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    Specifying KW_ONLY twice should raise an exception, but does not:

    >>> @dataclasses.dataclass
... class foo:
...   _: dataclasses.KW_ONLY
...   x: dataclasses.KW_ONLY
...

    @ericvsmith ericvsmith added the 3.10 only security fixes label May 3, 2021
    @ericvsmith ericvsmith self-assigned this May 3, 2021
    @ericvsmith ericvsmith added stdlib Python modules in the Lib dir type-bug An unexpected behavior, bug, or error 3.10 only security fixes labels May 3, 2021
    @ericvsmith ericvsmith self-assigned this May 3, 2021
    @ericvsmith ericvsmith added stdlib Python modules in the Lib dir type-bug An unexpected behavior, bug, or error labels May 3, 2021
    @ericvsmith
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    New changeset 99ad742 by Eric V. Smith in branch 'master':
    bpo-44015: dataclasses should allow KW_ONLY to be specified only once per class (GH-25841)
    99ad742

    @ezio-melotti ezio-melotti transferred this issue from another repository Apr 10, 2022
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    3.10 only security fixes stdlib Python modules in the Lib dir type-bug An unexpected behavior, bug, or error
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