refactor(enums): fix linter warnings

openfisca_core/indexed_enums/enum.py

@@ -64,14 +64,14 @@ def encode(
             return array
 
         # String array
-        if isinstance(array, numpy.ndarray) and array.dtype.kind in {"U", "S"}:
+        if array.dtype.kind in {"U", "S"}:
             array = numpy.select(
                 [array == item.name for item in cls],
                 [item.index for item in cls],
             ).astype(numpy.int16)
 
         # Enum items arrays
-        elif isinstance(array, numpy.ndarray) and array.dtype.kind == "O":
+        elif array.dtype.kind == "O":
             # Ensure we are comparing the comparable. The problem this fixes:
             # On entering this method "cls" will generally come from
             # variable.possible_values, while the array values may come from
@@ -84,12 +84,18 @@ def encode(
             # name to check that the values in the array, if non-empty, are of
             # the right type.
             if len(array) > 0 and cls.__name__ is array[0].__class__.__name__:
-                cls = array[0].__class__
+                klass = array[0].__class__
+
+            else:
+                klass = cls
 
             array = numpy.select(
-                [array == item for item in cls],
-                [item.index for item in cls],
+                [array == item for item in klass],
+                [item.index for item in klass],
             ).astype(numpy.int16)
 
         array = numpy.asarray(array, dtype=numpy.int16)
         return EnumArray(array, cls)
+
+
+__all__ = ["Enum"]

openfisca_core/indexed_enums/enum_array.py

@@ -149,16 +149,26 @@ def _is_an_enum(self, other: object) -> TypeGuard[t.Enum]:
         if self.possible_values is None:
             raise NotImplementedError
 
+        if other is None:
+            raise NotImplementedError
+
         return (
             not hasattr(other, "__name__")
             and other.__class__.__name__ is self.possible_values.__name__
         )
 
     def _is_an_enum_type(self, other: object) -> TypeGuard[type[t.Enum]]:
+        name: None | str
+
         if self.possible_values is None:
             raise NotImplementedError
 
-        return (
-            hasattr(other, "__name__")
-            and other.__name__ is self.possible_values.__name__
-        )
+        if other is None:
+            raise NotImplementedError
+
+        name = getattr(other, "__name__", None)
+
+        return isinstance(name, str) and name is self.possible_values.__name__
+
+
+__all__ = ["EnumArray"]