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gh-102558: [Enum] better handling of non-Enum EnumType classes #103060

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Merged
ethanfurman merged 2 commits into from
Mar 27, 2023
Merged

gh-102558: [Enum] better handling of non-Enum EnumType classes #103060

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1bef8ac
fix for non-Enum EnumType class
ethanfurman Mar 25, 2023
8739409
fix for non-Enum EnumType classes
ethanfurman Mar 27, 2023
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12 changes: 5 additions & 7 deletions Lib/enum.py
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Original file line number Diff line number Diff line change
Expand Up @@ -923,7 +923,7 @@ def _convert_(cls, name, module, filter, source=None, *, boundary=None, as_globa
def _check_for_existing_members_(mcls, class_name, bases):
for chain in bases:
for base in chain.__mro__:
if issubclass(base, Enum) and base._member_names_:
if isinstance(base, EnumType) and base._member_names_:
raise TypeError(
"<enum %r> cannot extend %r"
% (class_name, base)
Expand All @@ -942,7 +942,7 @@ def _get_mixins_(mcls, class_name, bases):
# ensure final parent class is an Enum derivative, find any concrete
# data type, and check that Enum has no members
first_enum = bases[-1]
if not issubclass(first_enum, Enum):
if not isinstance(first_enum, EnumType):
raise TypeError("new enumerations should be created as "
"`EnumName([mixin_type, ...] [data_type,] enum_type)`")
member_type = mcls._find_data_type_(class_name, bases) or object
Expand All @@ -954,7 +954,7 @@ def _find_data_repr_(mcls, class_name, bases):
for base in chain.__mro__:
if base is object:
continue
elif issubclass(base, Enum):
elif isinstance(base, EnumType):
# if we hit an Enum, use it's _value_repr_
return base._value_repr_
elif '__repr__' in base.__dict__:
Expand All @@ -980,12 +980,12 @@ def _find_data_type_(mcls, class_name, bases):
base_chain.add(base)
if base is object:
continue
elif issubclass(base, Enum):
elif isinstance(base, EnumType):
if base._member_type_ is not object:
data_types.add(base._member_type_)
break
elif '__new__' in base.__dict__ or '__init__' in base.__dict__:
if issubclass(base, Enum):
if isinstance(base, EnumType):
continue
data_types.add(candidate or base)
break
Expand Down Expand Up @@ -1186,8 +1186,6 @@ def _missing_(cls, value):
return None

def __repr__(self):
if not isinstance(self, Enum):
return repr(self)
v_repr = self.__class__._value_repr_ or repr
return "<%s.%s: %s>" % (self.__class__.__name__, self._name_, v_repr(self._value_))

Expand Down
1 change: 0 additions & 1 deletion Lib/test/test_enum.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1369,7 +1369,6 @@ def repr(self):
class Huh(MyStr, MyInt, Enum):
One = 1


def test_pickle_enum(self):
if isinstance(Stooges, Exception):
raise Stooges
Expand Down