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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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@ss7trader · Post #30198 · 20.03.2026 г., 18:28
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@dailychannels · Post #6391 · 04.10.2025 г., 01:00
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@ss7trader · Post #30789 · 11.05.2026 г., 15:09
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@ss7trader · Post #30778 · 09.05.2026 г., 12:36
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@ss7trader · Post #30748 · 06.05.2026 г., 18:41
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@ss7trader · Post #30695 · 29.04.2026 г., 18:52
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@ss7trader · Post #30615 · 24.04.2026 г., 12:24
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@ss7trader · Post #30619 · 25.04.2026 г., 13:41
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@ss7trader · Post #30593 · 23.04.2026 г., 14:29
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@ss7trader · Post #30274 · 26.03.2026 г., 20:49
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@ss7trader · Post #30147 · 17.03.2026 г., 17:55
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@ss7trader · Post #30106 · 14.03.2026 г., 08:14
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