databind.json 2.0.8

De-/serialize Python dataclasses to or from JSON payloads. Compatible with Python 3.7 and newer.

databind.json

The databind.json package implements the de-/serialization to or from JSON payloads using the databind.core framework.

Quickstart

import databind.json
import dataclasses

@dataclasses.dataclass
class ServerConfig:
  host: str
  port: int = 8080

@dataclasses.dataclass
class MainConfig:
  server: ServerConfig

payload = { 'server': { 'host': '127.0.0.1' } }
config = databind.json.load(payload, MainConfig)
assert config == MainConfig(ServerConfig('127.0.0.1'))

Examples for common use cases

Unions with literal matches

import dataclasses
import databind.json
from typing import Literal

@dataclasses.dataclass
class AwsMachine:
  region: str
  name: str
  instance_id: str
  provider: Literal["aws"] = "aws"

@dataclasses.dataclass
class AzureMachine:
  resource_group: str
  name: str
  provider: Literal["azure"] = "azure"

Machine = AwsMachine | AzureMachine

payload = {"provider": "azure", "resource_group": "foo", "name": "bar"}
assert databind.json.load(payload) == AzureMachine("foo", "bar")

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Copyright © 2020 – Niklas Rosenstein