How To Extend The Python Class Attributes For Enum Derived Classes

from enum import Enum class ErrorCode(str, Enum): GENERAL_ERROR = 'A general error has occurred.' INVALID_RECIPIENT_EMAIL_ADDRESS = 'The recipient email address provided i

Solution 1:

Enum was designed to not allow extending. Depending on your use-case, though, you have a couple options:

• build the enum dynamically from an external source (such as a json file). See When should I subclass EnumMeta instead of Enum? for the full details.

classCountry(JSONEnum):
        _init_ = 'abbr code country_name'# remove if not using aenum
        _file = 'some_file.json'
        _name = 'alpha-2'
        _value = {
                1: ('alpha-2', None),
                2: ('country-code', lambda c: int(c)),
                3: ('name', None),
                }

• use the extend_enum function the aenum library:

    extend_enum(ErrorCode, 'NEW_ERROR2', 'The new error 2')

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Disclosure: I am the author of the Python stdlib Enum, the enum34 backport, and the Advanced Enumeration (aenum) library.