[+] improve typing

python/online/fxreader/pr34/commands_typed/cli_bootstrap.py

@@ -13,7 +13,7 @@ import logging
 
 from typing import (Optional, Any, cast, Type, TypeVar,)
 from typing_extensions import (
-    Self, BinaryIO,
+    Self, BinaryIO, overload,
 )
 
 logger = logging.getLogger(__name__)
@@ -61,21 +61,45 @@ class PyProject:
 Key = TypeVar('Key')
 Value = TypeVar('Value')
 
+@overload
 def check_dict(
     value: Any,
     KT: Type[Key],
     VT: Type[Value],
+) -> dict[Key, Value]: ...
+
+@overload
+def check_dict(
+    value: Any,
+    KT: Type[Key],
+) -> dict[Key, Any]: ...
+
+def check_dict(
+    value: Any,
+    KT: Type[Key],
+    VT: Optional[Type[Value]] = None,
 ) -> dict[Key, Value]:
     assert isinstance(value, dict)
     value2 = cast(dict[Any, Any], value)
+
     assert all([
-        isinstance(k, KT) and isinstance(v, VT)
+        isinstance(k, KT) and (
+            VT is None or
+            isinstance(v, VT)
+        )
         for k, v in value2.items()
     ])
-    return cast(
+
-        dict[Key, Value],
+    if VT is None:
-        value,
+        return cast(
-    )
+            dict[Key, Any],
+            value,
+        )
+    else:
+        return cast(
+            dict[Key, Value],
+            value,
+        )
 
 def pyproject_load(
     d: pathlib.Path,
@@ -97,9 +121,21 @@ def pyproject_load(
             dict
         )
 
-        for k, v in content['project']['optional-dependencies'].items():
+        for k, v in check_dict(
-            assert isinstance(v, list)
+            check_dict(
-            assert isinstance(k, str)
+                check_dict(
+                    content,
+                    str,
+                    # Any,
+                )['project'],
+                str,
+                # Any,
+            )['optional-dependencies'],
+                str,
+                list[Any],
+        ).items():
+            # assert isinstance(v, list)
+            # assert isinstance(k, str)
 
             dependencies[k] = v