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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
Пребарај: #investing
@ethereumglobalnews · Post #1169 · 23.10.2025 г., 05:09
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@forexsignalstrialgroup · Post #17982 · 24.02.2026 г., 17:22
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@forexsignalstrialgroup · Post #18014 · 27.02.2026 г., 10:21
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@forexsignalstrialgroup · Post #17951 · 20.02.2026 г., 11:16
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@forexsignalstrialgroup · Post #17783 · 04.02.2026 г., 08:58
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@goodtraders · Post #8745 · 16.12.2024 г., 20:41
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@trading_signals8 · Post #769 · 17.02.2024 г., 11:36
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@trading_signals8 · Post #765 · 16.02.2024 г., 06:37
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@trading_signals8 · Post #760 · 15.02.2024 г., 06:26
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@forexsignalstrialgroup · Post #18092 · 10.03.2026 г., 08:00
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@forexsignalstrialgroup · Post #17718 · 31.01.2026 г., 09:30
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@tsuThoughts · Post #1052 · 06.02.2026 г., 04:36
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