Enable Ruff SLOT rules (#115043)

homeassistant/helpers/template.py

@@ -305,6 +305,8 @@ def gen_result_wrapper(kls: type[dict | list | set]) -> type:
 class TupleWrapper(tuple, ResultWrapper):
     """Wrap a tuple."""
 
+    __slots__ = ()
+
     # This is all magic to be allowed to subclass a tuple.
 
     def __new__(cls, value: tuple, *, render_result: str | None = None) -> Self:

homeassistant/util/event_type.py

@@ -18,3 +18,5 @@ class EventType(str, Generic[_DataT]):
 
     At runtime this is a generic subclass of str.
     """
+
+    __slots__ = ()

pyproject.toml

@@ -664,6 +664,7 @@ select = [
     "S608", # hardcoded-sql-expression
     "S609", # unix-command-wildcard-injection
     "SIM", # flake8-simplify
+    "SLOT", # flake8-slots
     "T100", # Trace found: {name} used
     "T20", # flake8-print
     "TID251", # Banned imports

tests/components/bluetooth/test_wrappers.py

@@ -383,7 +383,7 @@ async def test_passing_subclassed_str_as_address(
     _, cancel_hci0, cancel_hci1 = _generate_scanners_with_fake_devices(hass)
 
     class SubclassedStr(str):
-        pass
+        __slots__ = ()
 
     address = SubclassedStr("00:00:00:00:00:01")
     client = bleak.BleakClient(address)

tests/helpers/test_config_validation.py

@@ -544,7 +544,7 @@ def test_string(hass: HomeAssistant) -> None:
 
     # Test subclasses of str are returned
     class MyString(str):
-        pass
+        __slots__ = ()
 
     my_string = MyString("hello")
     assert schema(my_string) is my_string

tests/helpers/test_template.py

@@ -1270,7 +1270,7 @@ def test_to_json(hass: HomeAssistant) -> None:
     # Test special case where substring class cannot be rendered
     # See: https://github.com/ijl/orjson/issues/445
     class MyStr(str):
-        pass
+        __slots__ = ()
 
     expected_result = '{"mykey1":11.0,"mykey2":"myvalue2","mykey3":["opt3b","opt3a"]}'
     test_dict = {

tests/util/test_json.py

@@ -163,7 +163,7 @@ async def test_loading_derived_class():
     """Test loading data from classes derived from str."""
 
     class MyStr(str):
-        pass
+        __slots__ = ()
 
     class MyBytes(bytes):
         pass