python-configurationlisted
Install: claude install-skill Jartan-LLC/grimoire
# Python Configuration Management
Externalize configuration from code using environment variables and typed settings. Well-managed configuration enables the same code to run in any environment without modification.
## Core Concepts
### 1. Externalized Configuration
All environment-specific values (URLs, secrets, feature flags) come from environment variables, not code.
### 2. Typed Settings
Parse and validate configuration into typed objects at startup, not scattered throughout code.
### 3. Fail Fast
Validate all required configuration at application boot. Missing config should crash immediately with a clear message.
### 4. Sensible Defaults
Provide reasonable defaults for local development while requiring explicit values for sensitive settings.
## Quick Start
```python
from pydantic_settings import BaseSettings
from pydantic import Field
class Settings(BaseSettings):
database_url: str = Field(alias="DATABASE_URL")
api_key: str = Field(alias="API_KEY")
debug: bool = Field(default=False, alias="DEBUG")
settings = Settings() # Loads from environment
```
## Fundamental Patterns
### Pattern 1: Typed Settings with Pydantic
Create a central settings class that loads and validates all configuration.
```python
from pydantic_settings import BaseSettings
from pydantic import Field, PostgresDsn, ValidationError
import sys
class Settings(BaseSettings):
"""Application configuration loaded from environment variables."""
# Database
db_host: str =