Created
February 13, 2023 01:35
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enum with unknown or missing value
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| from enum import Enum | |
| class Foo(Enum): | |
| A = 1 | |
| B = 2 | |
| C = 3 | |
| def __str__(self): | |
| return self.name | |
| @classmethod | |
| def _missing_(cls, value): | |
| if cls._member_type_ is object: | |
| # construct a new singleton enum member | |
| new_member = object.__new__(cls) | |
| # include the value representation in _name_ because the Enum hash implementation relies on _name_ | |
| new_member._name_ = '%r' % value | |
| new_member._value_ = value | |
| # use setdefault in case another thread already created a composite with this value | |
| new_member = cls._value2member_map_.setdefault(value, new_member) | |
| return new_member |
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