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Изворен канал @pythonotes · Post #397 · 12 ное.

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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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Interesting Planet 🌍

@interesting_planet_facts · Post #1189 · 03.01.2026 г., 22:11

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🌎 The peregrine falcon holds the speed record for any animal on Earth. During hunting dives called “stoops,” it can reach over 320 kilometers per hour. This speed helps it catch birds in midair. ✨ #animals⚡#records⚡#speed 👉subscribe Interesting Planet 👉more Channels ​

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Interesting Planet 🌍

@interesting_planet_facts · Post #695 · 05.09.2025 г., 20:22

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🌎 The cheetah is the fastest land animal, capable of sprinting up to 112 kilometers per hour for short distances. Its slender body and long tail provide balance while chasing prey across African plains. ✨ #animals⚡#speed⚡#records 👉subscribe Interesting Planet ​

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Interesting Planet 🌍

@interesting_planet_facts · Post #589 · 19.08.2025 г., 16:22

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🌎 Some bamboo species can grow up to 91 centimeters in a single day, making bamboo one of the fastest-growing plants on Earth. This rapid growth helps bamboo quickly regenerate after being harvested and provides vital habitats for many animals. ✨ #botany⚡#speed⚡#ecosystems 👉subscribe Interesting Planet

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Universe Mysteries 🪐

@cosmomyst · Post #222 · 04.09.2025 г., 20:11

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🪐 The pulsar PSR J1748−2446ad in the globular cluster Terzan 5 holds the record as the fastest-spinning known pulsar, rotating an astonishing 716 times per second. Pulsars are ultra-dense neutron stars that emit narrow beams of radiation, and this particular cosmic beacon spins so rapidly that its surface moves at about a quarter of the speed of light. ✨ #pulsars⚡#neutronstars⚡#speed⚡#nasa⚡#galaxy⚡#stars⚡#astronomy⚡#universe⚡#cosmos⚡#space 👉subscribe Universe Mysteries ​

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Interesting Planet 🌍

@interesting_planet_facts · Post #524 · 08.08.2025 г., 20:22

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🌎 Lightning-fast, the peregrine falcon dives at up to 320 km/h, making it the fastest animal on Earth. Specialized nostrils and strong muscles let it hunt mid-air with pinpoint accuracy. ✨ #falcon⚡#speed⚡#wildlife 👉subscribe Interesting Planet

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