Pydantic BaseSettings: Typed, Layered Configuration
Pydantic's BaseSettings treats configuration as typed data, not just strings. It automatically loads and validates settings from environment variables, .env files, and secrets stores into a Python object.
Pydantic's BaseSettings is a universal adapter for your app's configuration. You define the shape and types of your settings once, and it automatically populates them from multiple sources. It's ideal for managing settings across environments, loading from .env files in development and environment variables or cloud secret stores in production. The default source priority is critical: an environment variable will always override a value from a .env file.
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