from pydantic import BaseModel, Field, ConfigDict
from enum import Enum, auto, StrEnum

class NormalEnum(Enum):
     FOO = 'foo'
     BAR = 'bar'

class StringEnum(str, Enum):
     FOO = 'foo'
     BAR = 'bar'

class MyModel(BaseModel):
     a: Literal[NormalEnum.FOO]
     b: Literal[StringEnum.FOO]
     x: NormalEnum
     y: StringEnum

MyModel(a="foo", b="foo", x="foo", y="foo")

"""
ValidationError: 1 validation error for MyModel
a
  Input should be <NormalEnum.FOO: 'foo'> [type=literal_error, input_value='foo', input_type=str]
    For further information visit https://errors.pydantic.dev/2.5/v/literal_error
"""