115     def __prepare__(metacls, cls, bases):  argument
119         member_type, first_enum = metacls._get_mixins_(bases)
124     def __new__(metacls, cls, bases, classdict):  argument
129         member_type, first_enum = metacls._get_mixins_(bases)
153         enum_class = super().__new__(metacls, cls, bases, classdict)
377         bases = (cls, ) if type is None else (type, cls)
378         _, first_enum = cls._get_mixins_(bases)
379         classdict = metacls.__prepare__(class_name, bases)
399         enum_class = metacls.__new__(metacls, class_name, bases, classdict)
418     def _get_mixins_(bases):  argument
425         if not bases:
432         for base in bases:
444         if not issubclass(bases[0], Enum):
445             member_type = bases[0]     # first data type
446             first_enum = bases[-1]  # enum type
448             for base in bases[0].__mro__: