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
A newly created wallet received 488,599 $HYPE worth $17.18M from #FalconX.
Address: 0x9ff9dbfadad1def3075d340bfc151c9392526880
https://x.com/OnchainLens/status/2039867557751214144
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A newly created wallet received 450 $BTC worth $30.27M from #FalconX.
Address: bc1q3aydm3nd6c7hejscde0hsdzsf4dsxkxd0l8f0dwn45y2znlh0dxq2aga8r
https://x.com/OnchainLens/status/2038782817791066483
Follow @onchainlens for more onchain updates
The whale "0xfb7" has further bought 20,013 $ETH ($59M) from #FalconX. The whale now holds 80,115 $ETH, worth $236.55M. Addresses: - 0xfb78aa8f38843629e89951d9db6fdc398d75e0a3 - 0xd4584bf988c9e8994688b56484e2f74ceaeefb20 https://x.com/OnchainLens/stat…
Just In: Arthur Hayes (@CryptoHayes) sent 3,597,122 $ENA ($499.34K) and 327,869 $PENDLE ($501.64K) to #FalconX and likely to send more fund.
8 hours ago, he sent 2.31M $LDO worth $980.3K to #FalconX.
https://intel.arkm.com/explorer/entity/arthur-hayes
https://x.com/OnchainLens/status/2018576988945178669
Follow @OnchainLens for more Onchain Updates
While others are panic selling, whale "0xFB7" further bought 13,000 $ETH ($30.93M) from #FalconX.
This brings the whale's holdings to 173,582 $ETH ($407.62M) and 750 $cbBTC ($59M).
https://intel.arkm.com/explorer/address/0xFB78AA8F38843629e89951D9db6FdC398d75e0A3
https://x.com/OnchainLens/status/2018471314684829769
Follow @OnchainLens for more Onchain Updates.
The whale "0xFB7" has further bought 20,000 $ETH for $56.03M from #FalconX.
This brings the whale's holdings to 110,154 $ETH, valued at $311.26M in staking.
Address: 0xFB78AA8F38843629e89951D9db6FdC398d75e0A3
https://x.com/OnchainLens/status/2017028375014154514
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Bitmine (@BitMNR) bought 20,000 $ETH ($58.22M) from #FalconX and further staked 184,960 $ETH, worth $538M.
In total, they have staked 2,128,160 $ETH, valued at $6.22B.
https://intel.arkm.com/explorer/entity/bitmine
https://intel.arkm.com/explorer/address/0x0E0d36c115F66a08958756d860E16b2FbE5AadbF
https://x.com/OnchainLens/status/2015932786839113916
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Bitmine ( @BitMNR) has received 31.75K $ETH worth ($93.50M) from #FalconX
Address - 0x1C79347985300642be2fB93b44BB6C4A2e46CEf8
https://x.com/OnchainLens/status/2003525975980568644
Follow @onchainlens for more onchain updates
3 newly created wallets received 2,509 $BTC worth $221.07M from #FalconX in the past 12 hours.
https://intel.arkm.com/explorer/address/35hG5iJGYsojY7F6jdHEQ3PjkTzdpvv2Vd
https://intel.arkm.com/explorer/address/3Ev15ETyusbhULAxtPs1vXXrAqJHfDbsWt
https://intel.arkm.com/explorer/address/32t7CyeQ5HMSnnnmLEKYJhqBocEMPHEVCq
https://x.com/i/status/2002172199269265678
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A newly created wallet received 836.4 $BTC, worth $73.67M, from #FalconX.
Address: 32t7CyeQ5HMSnnnmLEKYJhqBocEMPHEVCq
https://x.com/OnchainLens/status/2002002079565635946
Follow @onchainlens for more onchain updates
Ethena Labs (@ethena_labs) has sent 23.3M $ENA worth $4.74M into #FalconX, likely to sell 9 hours ago.
The wallet still holds 123.4M $ENA worth $25M
Address: 0xf0465df588906d820f831970262bdcca0f2b3e2d
https://x.com/i/status/2001968278785368460
Follow @onchainlens for more onchain updates