Add extra typing annotations

hgrecco · Nov 3, 2023 · 894f4f0 · 894f4f0
1 parent f9e139e
commit 894f4f0
Showing 1 changed file with 3 additions and 5 deletions.
diff --git a/pint/converters.py b/pint/converters.py
@@ -13,7 +13,7 @@
 from dataclasses import dataclass
 from dataclasses import fields as dc_fields
 
-from typing import Any, Optional
+from typing import Any, Optional, ClassVar
 
 from ._typing import Magnitude
 
@@ -24,10 +24,8 @@
 class Converter:
     """Base class for value converters."""
 
-    # list[type[Converter]]
-    _subclasses = []
-    # dict[frozenset[str], type[Converter]]
-    _param_names_to_subclass = {}
+    _subclasses: ClassVar[list[type[Converter]]] = []
+    _param_names_to_subclass: ClassVar[dict[frozenset[str], type[Converter]]] = {}
 
     @property
     def is_multiplicative(self) -> bool: