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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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Пронајдени 17 слични објави

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Vaccines are one of the best tools we have to improve health and well-being around the world. #TakeResponsibility, encourage your loved ones and those around you to #GetVaccinated. Visit https://www.vacsitefinder.nphcda.gov.ng/ to locate the nearest vaccination site to you.

📢 Nigerians are advised to continue to #TakeResponsibility. Visit the nearest government health facility to #GetVaccinated if you have not been previously vaccinated. 🔗 Public Health Advisory: https://www.ncdc.gov.ng/news/429/public-health-advisory-following-the-presidential-approval-for-the-relaxation-of-covid-19-safety-measures-%26-travel-advisory @PSCCOVID19 Update: https://covid19.ncdc.gov.ng/media/files/Press_Release_-_Relaxation_of_COVID-19_Rules_Ako_221212_210142.pdf

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#COVID19 is still a health threat If you are experiencing symptoms associated with #COVID19, visit the nearest testing centre close to you for diagnosis & treatment #GetVaccinated, the vaccine protects you from severe illness, hospitalisation & death #TakeResponsibility

Severe disease, admissions and deaths disproportionately affect the unvaccinated & those with risk factors i.e., older people, people with underlying health conditions and the immunocompromised. #GetVaccinated against #COVID19 to stay safe and healthy. #TakeResponsibility

Getting vaccinated protects you from severe illness, hospitalisation & death from the #COVID19 virus. #TakeResponsibility, encourage your loved ones and those around you to #GetVaccinated. Visit https://www.vacsitefinder.nphcda.gov.ng/ to locate the nearest vaccination site to you.

Elderly persons & those with existing medical conditions are encouraged to take extra precautions to stay safe & healthy. 💉#GetVaccinated to limit your risk of getting infected with #COVID19. Vaccination sites: https://nphcda.vaccination.gov.ng/vaccination-sites #TakeResponsibility

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