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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: #infra
@developmentnewsindia · Post #44438 · 05.05.2026 г., 08:00
Change in West Bengal Govt also means projects stuck now can be implemented 🔸Varanasi - Kolkata Expressway 🔸Gorakhpur - Siliguri Expressway 🔸Extension of Eastern Dedicated Freight Corridor from Bihar to Bengal 🔸Varanasi - Siliguri High Speed Rail Corridor will also see timely execution #Infra
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@developmentnewsindia · Post #44286 · 01.05.2026 г., 10:10
India’s Doppler Weather Radar Network Grows From 14 To 50 Units Since 2014, Now Covers Over 87 Per Cent Of Country Source #Infra
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@developmentnewsindia · Post #44272 · 01.05.2026 г., 04:32
India's toll plazas gets a serious upgrade. The Multi-Lane Free Flow (MLFF) system is now live and aim is to eventually transition to no boom barriers, no queues, no stopping with FASTag deducted automatically. 108 toll plazas across major national highways, with full rollout targeting all four-lane+ corridors by 2029. The end goal is to eliminate human intervention, no revenue leakage, no fuel wasted idling at barriers. #Infra
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@developmentnewsindia · Post #44066 · 25.04.2026 г., 14:38
Mumbai-Ahmedabad Bullet Train Project: Assembly of India's largest-ever Tunnel Boring Machine (TBM), with a diameter of 13.56 meters, progressing at Shaft 2 in Vikhroli, Mumbai. Drilling is expected to begin in July 2026. #Infra
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@developmentnewsindia · Post #43982 · 23.04.2026 г., 12:33
PM Modi to inaugurate the 594 km long Ganga Expressway on April 29 India's longest expressway, linking Meerut-Prayagraj via 12 districts, cutting travel time by ~50% and boosting connectivity & trade #Infra
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@developmentnewsindia · Post #43860 · 20.04.2026 г., 12:46
Not just sea bridges, coastal roads, tunnels, and metros. In housing too, Mumbai is being rebuilt from the ground up. Dharavi: 641 acres, ₹95,700 crore. Motilal Nagar in Goregaon: 143 acres, up to ₹1,00,000 crore. BDD Chawls in Worli: 87 acres with Tata, Capacit'e and CITIC group. Bhendi Bazaar Kamathipura 5 landmark redevelopment projects with Adani, Tata, and marquee developers. Combined investment crossing ₹2,00,000 crore. The city that powers India's economy is finally getting the urban infrastructure its ambition always deserved #Infra
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@developmentnewsindia · Post #43859 · 20.04.2026 г., 12:46
A summary of Mumbai's public transport infrastructure projects which have underground construction involved. #Infra
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@developmentnewsindia · Post #43653 · 16.04.2026 г., 03:04
Zoji La Tunnel Nears a Major Breakthrough India’s strategic Zoji La tunnel connecting Kashmir to Ladakh is on the brink of a breakthrough, with the final blast expected by end of May 2026. Only 300 meters remain of the 13.1 km tunnel, with work progressing from both Sonamarg and Minamarg ends. #Infra
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@developmentnewsindia · Post #43636 · 15.04.2026 г., 11:37
Delhi-Dehradun expressway #Infra
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@developmentnewsindia · Post #43620 · 15.04.2026 г., 08:20
Infrastructure spending in India has grown six-fold to more than ₹12 lakh crore a year since 2014, compared with less than ₹2 lakh crore before 2014, Prime Minister Narendra Modi said on Tuesday. #Infra
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@developmentnewsindia · Post #43394 · 09.04.2026 г., 03:35
Mumbai's operational metro network (post-April 7 rollout) will extend to 90km. #Infra
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@developmentnewsindia · Post #43256 · 05.04.2026 г., 12:44
Bogibeel Bridge (4.94 km) built on the mighty Brahmaputra river cuts Dibrugarh–Itanagar road distance by 150 km and rail by 705 km. Project cost revised to ₹4,857 crore from ₹3,230 crore; inaugurated in 2018 after 2002 start. Double-line rail + 3-lane road link boosts connectivity across Assam–Arunachal. #Infra
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