Overview

Pydantic Settings 2.3, released on June 15, 2024, adds a CLI settings source to load configuration from command-line arguments.

Main Features

CLI source

The new CliSettingsSource automatically generates a CLI argument parser from the Pydantic model.

python 
from pydantic_settings import BaseSettings

class AppConfig(BaseSettings):
    host: str = 'localhost'
    port: int = 8000
    debug: bool = False

    model_config = {'cli_parse_args': True}

# python app.py --host 0.0.0.0 --port 9000 --debug
config = AppConfig()
print(config.host, config.port)

Sources