The following code should work (fromhttps://stackoverflow.com/a/46780742/208880):    class BaudRate(Enum):        cls = vars()        regexp = r"(?:^|,)B(?P<rate>\d+)"        rates = sorted(map(int, re.findall(regexp, ",".join(dir(termios)))))        for value in rates:            cls['B%d' % value] = value        @classmethod        def valid_rate(cls, value):            return (any(value == item.value for item in cls))This doesn't work because EnumMeta does not allow names to be reassigned nor deleted.  aenum gets around this by allowing an _ignore_ attribute which contains the names that should not be tracked (and, in fact, those names are removed from the final class).Unless a better idea is put forward, I will add _ignore_ support to Enum.

Not necessarily an argument against this feature, but two workarounds exist for this already:1. Use `nonlocal` to prevent `value` going into the class namespace:    value = None        class BaudRate(enum.Enum):            nonlocal value        for value in rates:            locals()['B%d' % value] = value            @classmethod        def valid_rate(cls, value):            return (any(value == item.value for item in cls))2. Use `types.new_class`, which is more suited to dynamic class creation anyway:    def make_cls(ns):        for value in rates:            ns['B%d' % value] = value        @classmethod        def valid_rate(cls, value):            return (any(value == item.value for item in cls))        ns['valid_rate'] = valid_rate    types.new_class('BaudRate', (enum.Enum,), exec_body=make_cls)

New changeseta4b1bb4801f7a941ff9e86b96da539be1c288833 by Ethan Furman in branch 'master':bpo-31801:  Enum:  add _ignore_ as class option (#5237)https://github.com/python/cpython/commit/a4b1bb4801f7a941ff9e86b96da539be1c288833