An extension of Pydantic that loads application settings from environment variables, .env files, secrets backends, or CLI args, with full type validation and IDE autocomplete.
Pydantic Settings (formerly pydantic.BaseSettings) reads configuration from environment variables and validates it as a typed Pydantic model. Override sources in priority order: CLI args → environment → .env file → Vault/secrets → defaults. Type errors at config load time prevent the classic 'service starts fine but explodes on first request' problem caused by mistyped env vars.
Loading DATABASE_URL, API_KEY, and DEBUG flags into a typed Settings model, so invalid env at startup fails fast with a clear error instead of mysterious runtime crashes.
Pydantic Settings turns environment configuration into a first-class typed contract and catches misconfigurations at boot instead of in production logs.
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