An example using EnumMeta, with EASE!

EnumMetaExample.py

>>> from enum import EnumMeta, Enum
>>> Color3 = EnumMeta('Color3', (Enum,), (_ := EnumMeta.__prepare__(
...     'Color3', (Enum,),)) and any(map(_.__setitem__, *(zip(*{
...         'RED': 1,
...         'GREEN': 2,
...         'BLUE': 3,
...     }.items())))) or _
... )
>>> print(Color3(1)) # or without print(): <Color3.RED: 1>
Color3.RED

NonInterpreterEnumMetaExample.py

from enum import EnumMeta, Enum
Color3 = EnumMeta('Color3', (Enum,), (_ := EnumMeta.__prepare__(
    'Color3', (Enum,),)) and any(map(_.__setitem__, *(zip(*{
        'RED': 1,
        'GREEN': 2,
        'BLUE': 3,
    }.items())))) or _
)
print(repr(Color3(1))) # <Color3.RED: 1>