Routine updates.

Building a unified configuration system.

leads/utils.py

@@ -44,7 +44,7 @@ def __init__(self,
     def __len__(self) -> int:
         return len(self._data)
 
-    def __getitem__(self, item: slice) -> T | list[T]:
+    def __getitem__(self, item: int | slice) -> T | list[T]:
         return self._data[item]
 
     def __str__(self) -> str:

leads_vec/config.py

@@ -0,0 +1,22 @@
+from json import load as _load, loads as _loads
+from typing import TextIO as _TextIO, Any as _Any
+
+
+class Config(object):
+    def __init__(self, base: dict[str, _Any]) -> None:
+        self._d: dict[str, _Any] = base
+
+    def __getitem__(self, name: str) -> _Any | None:
+        return self._d.get(name, None)
+
+    def __getattr__(self, name: str) -> _Any | None:
+        return self[name]
+
+    def require(self, name: str) -> _Any:
+        if r := self[name] is None:
+            raise KeyError(name)
+        return r
+
+
+def load_config(file: str | _TextIO) -> Config:
+    return Config(_loads(file) if isinstance(file, str) else _load(file))