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bpo-37868: Improve is_dataclass for instances. (GH-15325)

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Eric V. Smith 2019-08-20 01:40:28 -04:00 • committed by GitHub
parent d3c8d73514
commit b0f4dab873
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3 changed files with 32 additions and 2 deletions
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5
Lib/dataclasses.py
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@ -1015,13 +1015,14 @@ def fields(class_or_instance):
def _is_dataclass_instance(obj):
"""Returns True if obj is an instance of a dataclass."""
return not isinstance(obj, type) and hasattr(obj, _FIELDS)
return hasattr(type(obj), _FIELDS)
def is_dataclass(obj):
"""Returns True if obj is a dataclass or an instance of a
dataclass."""
return hasattr(obj, _FIELDS)
cls = obj if isinstance(obj, type) else type(obj)
return hasattr(cls, _FIELDS)
def asdict(obj, *, dict_factory=dict):