Pydantic

app/config/__init__.py

@@ -0,0 +1 @@
+from .settings import get_settings

app/config/settings.py

@@ -0,0 +1,28 @@
+from functools import lru_cache
+
+from pydantic_settings import BaseSettings, SettingsConfigDict
+from pydantic import BaseModel
+from pathlib import Path
+import yaml
+
+class AppConfig(BaseModel):
+  host: str = "127.0.0.1"
+  port: int = 8000
+  reload: bool = True
+
+class Settings(BaseSettings):
+  model_config = SettingsConfigDict(env_prefix="KARL_", env_nested_delimiter="__")
+  app: AppConfig = AppConfig()
+
+  @classmethod
+  def from_yaml(cls, path: Path | str = "config/config.yaml") -> "Settings":
+    p = Path(path)
+    data = {}
+    if p.exists():
+      with p.open("r", encoding="utf-8") as fh:
+        data = yaml.safe_load(fh) or {}
+    return cls(**data)
+
+@lru_cache
+def get_settings() -> Settings:
+  return Settings.from_yaml()