Add type annotation and mypy config

khard/carddav_object.py

@@ -996,8 +996,8 @@ def _parse_yaml(input: str) -> Dict:
         return contact_data
 
     @staticmethod
-    def _set_string_list(setter: Callable[[Union[str, List]], None], key: str,
-                         data: Dict) -> None:
+    def _set_string_list(setter: Callable[[str], None], key: str,
+                         data: Dict[str, Union[str, List[str]]]) -> None:
         """Pre-process a string or list and set each value with the given
         setter
 

pyproject.toml

@@ -54,9 +54,11 @@ write_to = "khard/version.py"
 
 [tool.mypy]
 packages = "khard"
+check_untyped_defs = true
+disallow_untyped_calls = true
+warn_redundant_casts = true
 warn_unused_configs = true
 warn_unused_ignores = true
-warn_redundant_casts = true
 
 [[tool.mypy.overrides]]
 # These do not provide type anotations or stub files