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bpo-45663: Fix is_dataclass() for dataclasses which are subclasses of types.GenericAlias (GH-29294)

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(cherry picked from commit 446be16686)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
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Miss Islington (bot) 2021-12-05 13:25:43 -08:00 • committed by GitHub
parent 52a9a71fe6
commit 19050711f5
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3 changed files with 15 additions and 1 deletions
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Lib/dataclasses.py
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@ -1047,7 +1047,7 @@ def _is_dataclass_instance(obj):
def is_dataclass(obj):
"""Returns True if obj is a dataclass or an instance of a
dataclass."""
cls = obj if isinstance(obj, type) else type(obj)
cls = obj if isinstance(obj, type) and not isinstance(obj, GenericAlias) else type(obj)
return hasattr(cls, _FIELDS)