added type hints

.github/workflows/pr.yaml

@@ -30,5 +30,7 @@ jobs:
           POETRY_VIRTUALENVS_CREATE: false
       - name: Check formatting and linting
         run: poetry run ruff check
+      - name: Static type checking
+        run: poetry run mypy pydpkg/
       - name: Test with pytest
         run: poetry run pytest tests/

pydpkg/base.py

@@ -2,10 +2,14 @@
 Base class to avoid pylint complaining about duplicate code
 """
 
+from __future__ import annotations
+
+from typing import Any
+
 
 class _Dbase:
     # pylint: disable=too-few-public-methods
-    def __getitem__(self, item):
+    def __getitem__(self, item: str) -> Any:
         """Overload getitem to treat the message plus our local
         properties as items.
 
@@ -17,6 +21,6 @@ def __getitem__(self, item):
             return getattr(self, item)
         except AttributeError:
             try:
-                return self.__getattr__(item)
+                return self.__getattr__(item)  # type: ignore[attr-defined]
             except AttributeError as ex:
                 raise KeyError(item) from ex