mirror of
https://github.com/kennethreitz/pydantic.git
synced 2026-06-05 23:00:18 +00:00
Samuel Colvin
33 lines
905 B
Python
33 lines
905 B
Python
from typing import ClassVar, List, Union
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from typing_extensions import Literal
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from pydantic import BaseModel, ValidationError
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class Cake(BaseModel):
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kind: Literal['cake']
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required_utensils: ClassVar[List[str]] = ['fork', 'knife']
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class IceCream(BaseModel):
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kind: Literal['icecream']
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required_utensils: ClassVar[List[str]] = ['spoon']
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class Meal(BaseModel):
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dessert: Union[Cake, IceCream]
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print(type(Meal(dessert={'kind': 'cake'}).dessert).__name__)
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#> Cake
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print(type(Meal(dessert={'kind': 'icecream'}).dessert).__name__)
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#> IceCream
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try:
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Meal(dessert={'kind': 'pie'})
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except ValidationError as e:
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print(str(e))
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"""
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2 validation errors
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dessert -> kind
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unexpected value; permitted: 'cake' (type=value_error.const; given=pie; permitted=('cake',))
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dessert -> kind
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unexpected value; permitted: 'icecream' (type=value_error.const; given=pie; permitted=('icecream',))
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"""
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