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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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SingSing Announcement

@singsingchannel · Post #877 · 05.10.2024 г., 09:25

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SingSing Announcement

@singsingchannel · Post #876 · 05.10.2024 г., 07:53

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SingSing Announcement

@singsingchannel · Post #835 · 26.09.2024 г., 01:06

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Venture Village Wall 🦄

@venturevillagewall · Post #3994 · 27.01.2025 г., 01:00

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STAR VET BOOKS

@starvetbooks · Post #4994 · 16.03.2025 г., 06:10

💉💉#XYLOCAINE/ #LIDOCAINE_INJECTION💉💉 👉Lidocaine 2% Injection is a potent, Regional/local anesthetic. 👉 Formulated for producing epidural, nerve conduction& infiltration anesthesia. 👉 It is designed for use in dogs, cats, cattle & horses 💉#PRODUCT Injectable solution 💉#COMPOSITION 👉 Each mL of the 100mL Lidocaine 2% contains: ✓Lidocaine HCl: 2.0% ✓Propylene Glycol: 5.2% ✓NaCl: 0.5% ✓Sodium Lactate: 0.5% ✓Preservatives: Methylparaben (0.15%) ✓Sodium Metabisulfite (0.10%) ✓Propylparaben (0.03%) ✓Disodium Edetate (0.001%) 💉#INDICATIONS/USES 👉Local or regional anesthesia in various animal species 👉Nerve blocks for surgical and diagnostic procedures 👉Pain management during minor surgeries in pets & livestock 💉#CONTRAINDICATIONS/CAUTIONS 👉It's a well tolerated 👉Contraindicated in animals with known hypersensitivity to it 👉Caution is advised in animals with pre-existing cardiac conditions. 💉#ADMINISTRATION/DOSAGE 👉#EPIDURAL ✓Cattle/Horses: 5-15 mL. ✓Dogs)Cats: 1 mL/2.5Kg 👉#NERVE_BLOCK ✓Cattle/Horses: 5-20 mL. 👉#INFILTRATION ✓Dilute to a 0.5% conc (1 mL of 2% solution diluted with 3 mL of sterile water = 4 mL of a 0.5% solution 💉#WITHDRAWAL PERIOD 👉 1 day for meat & 24 hours for milk after epidural use of lidocaine 👉 4 days for meat & 72 hours for milk after subcutaneous use of lidocaine. https://t.me/starvetbooks