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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"is_dataclass() does not work for dataclasses which are subclasses of types.GenericAlias","articleBody":"BPO | [45663](https://bugs.python.org/issue45663)\n--- | :---\nNosy | @gvanrossum, @ericvsmith, @serhiy-storchaka, @miss-islington\nPRs | \u003cli\u003epython/cpython#29294\u003c/li\u003e\u003cli\u003epython/cpython#29925\u003c/li\u003e\u003cli\u003epython/cpython#29926\u003c/li\u003e\n\n\u003csup\u003e*Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.*\u003c/sup\u003e\n\n\u003cdetails\u003e\u003csummary\u003eShow more details\u003c/summary\u003e\u003cp\u003e\n\nGitHub fields:\n```python\nassignee = None\nclosed_at = \u003cDate 2021-12-07.12:01:12.403\u003e\ncreated_at = \u003cDate 2021-10-28.20:10:31.152\u003e\nlabels = ['type-bug', 'library', '3.9', '3.10', '3.11']\ntitle = 'is_dataclass() does not work for dataclasses which are subclasses of types.GenericAlias'\nupdated_at = \u003cDate 2021-12-07.12:01:12.402\u003e\nuser = 'https://github.com/serhiy-storchaka'\n```\n\nbugs.python.org fields:\n```python\nactivity = \u003cDate 2021-12-07.12:01:12.402\u003e\nactor = 'serhiy.storchaka'\nassignee = 'none'\nclosed = True\nclosed_date = \u003cDate 2021-12-07.12:01:12.403\u003e\ncloser = 'serhiy.storchaka'\ncomponents = ['Library (Lib)']\ncreation = \u003cDate 2021-10-28.20:10:31.152\u003e\ncreator = 'serhiy.storchaka'\ndependencies = []\nfiles = []\nhgrepos = []\nissue_num = 45663\nkeywords = ['patch']\nmessage_count = 4.0\nmessages = ['405256', '407739', '407743', '407745']\nnosy_count = 4.0\nnosy_names = ['gvanrossum', 'eric.smith', 'serhiy.storchaka', 'miss-islington']\npr_nums = ['29294', '29925', '29926']\npriority = 'normal'\nresolution = 'fixed'\nstage = 'resolved'\nstatus = 'closed'\nsuperseder = None\ntype = 'behavior'\nurl = 'https://bugs.python.org/issue45663'\nversions = ['Python 3.9', 'Python 3.10', 'Python 3.11']\n```\n\n\u003c/p\u003e\u003c/details\u003e\n","author":{"url":"https://github.com/serhiy-storchaka","@type":"Person","name":"serhiy-storchaka"},"datePublished":"2021-10-28T20:10:31.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":4},"url":"https://github.com/89826/cpython/issues/89826"}