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@wukongcm · Post #46 · 19.11.2024 г., 03:27
Hey WUKERS, 🔥 This Game Is Yours, We Need You! 👉 Show yourself: https://t.me/bmwukongbot/join?startapp=L29WAAMR #Wukong
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Изворен канал @pythonotes · Post #397 · 12 ное.
Использование Pydantic сегодня стало нормой, и это правильно. Но иногда на ревью вижу, что используют его не всегда корректно. Например, метод BaseModel.model_dump() по умолчанию не преобразует стандартные типы, такие как datetime, UUID или Decimal, в простой сериализуемый для JSON вид. Тогда пишут кастмоный сериализатор для этих типов чтобы функция json.dump() не падала с ошибкой. import uuid from datetime import datetime from decimal import Decimal from uuid import UUID from pydantic import BaseModel class MyModel(BaseModel): id: UUID date: datetime value: Decimal obj = MyModel( id=uuid.uuid4(), date=datetime.now(), value='1.23' ) print(obj.model_dump()) # не подходит для json.dump # { # 'id': UUID('4f8c1bc4-25fd-40cd-9dbe-2c73639b0dc1'), # 'date': datetime.datetime(2025, 12, 12, 12, 12, 12, 111111), # 'value': Decimal('1.23') # } # добавляем свой кастомный сериализатор json.dumps(obj.model_dump(), cls=MySerializer) # { # 'id': '4f8c1bc4-25fd-40cd-9dbe-2c73639b0dc1', # 'date': '2025-12-12T12:12:12.111111', # 'value': '1.23' # } В данном случае класс MySerializer обрабатывает datetime, UUID и Decimal. Например так: class MySerializer(json.JSONEncoder): def default(self, o): if isinstance(o, Decimal): return str(o) elif isinstance(o, datetime): return o.isoformat() elif isinstance(o, UUID): return str(o) return super().default(o) Специально для тех, кто всё еще так делает - в этом нет необходимости! Pydantic может это сделать сам, просто нужно добавить параметр mode="json". json.dumps(obj.model_dump(mode="json")) # { # 'id': '4f8c1bc4-25fd-40cd-9dbe-2c73639b0dc1', # 'date': '2012-12-12T12:12:12.111111', # 'value': '1.23' # } #pydantic#libs
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Wukong 🙈
@wukongcm · Post #44 · 14.11.2024 г., 05:16
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@wukongcm · Post #42 · 25.10.2024 г., 07:39
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@wukongcm · Post #39 · 21.10.2024 г., 07:47
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@wukongcm · Post #36 · 17.10.2024 г., 07:51
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@wukongcm · Post #34 · 12.10.2024 г., 07:55
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@wukongcm · Post #33 · 11.10.2024 г., 07:53
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@wukongcm · Post #31 · 09.10.2024 г., 08:26
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@wukongcm · Post #43 · 26.10.2024 г., 07:42
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@wukongcm · Post #40 · 22.10.2024 г., 07:58
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@wukongcm · Post #37 · 18.10.2024 г., 07:53
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@wukongcm · Post #35 · 16.10.2024 г., 07:48
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