Kiss György added the comment:
Yes, sorry I forgot about that. Here is a minimal example:
from enum import EnumMeta, Enum
from types import DynamicClassAttribute
class _MultiMeta(EnumMeta):
def __init__(enum_class, cls, bases, classdict):
# make sure we only have tuple values, not single values
for member in enum_class.__members__.values():
if not isinstance(member._value_, tuple):
raise ValueError('{!r}, should be tuple'.format(member._value_))
def __call__(cls, suit):
for member in cls:
if suit in member._value_:
return member
return super().__call__(suit)
class MultiValueEnum(Enum, metaclass=_MultiMeta):
@DynamicClassAttribute
def value(self):
"""The value of the Enum member."""
return self._value_[0]
class IncorrectAliasBehavior(MultiValueEnum):
first = 1, 2, 3
second = 4, 5, 6
alias_to_first = 1, 2, 3
When you call IncorrectAliasBehavior.alias_to_first, the documentation says it
should return IncorrectAliasBehavior.first, but in this case it returns
IncorrectAliasBehavior.alias_to_first, because canonical_member.value is
referenced on line 162, and so it returns the redefined value, not the
internally used one.
This was very confusing for me.
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue22339>
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