python で int で値を入れつつ、json 化の際には文字列を使う Enum の作り方

class Int2StrEnum(StrEnum):
    def __new__(cls, int_value, string_value):
        obj = str.__new__(cls, string_value)
        obj._value_ = string_value
        obj.int_value = int_value
        return obj

    @classmethod
    def from_int(cls, value: int):
        for member in cls:
            # noinspection PyUnresolvedReferences
            if member.int_value == value:
                return member
        raise ValueError(f"{value} is not a valid value for {cls.__name__}")


class A(Int2StrEnum):
   AAA = (1, "AAA(jsonで使う文字列)")
   BBB = (2, "BBB")
   CCC = (3, "CCC")

みたいに定義しておいて、

# 値をセットするとき
assert A.from_int(1) is A.AAA

# json.dumps のとき
json.dump({'a': A.AAA})  # そのまま渡せばいい