Add missing return type annotation for special method `__init__ (#952)

Fix Ruff - ANN204

nornir/core/exceptions.py

@@ -75,7 +75,7 @@ class NornirSubTaskError(Exception):
     Raised by nornir when a sub task managed by :meth:`nornir.core.Task.run` has failed
     """
 
-    def __init__(self, task: "Task", result: "Result"):
+    def __init__(self, task: "Task", result: "Result") -> None:
         self.task = task
         self.result = result
 

nornir/core/task.py

@@ -48,7 +48,7 @@ def __init__(
         severity_level: int = DEFAULT_SEVERITY_LEVEL,
         parent_task: Optional["Task"] = None,
         **kwargs: str,
-    ):
+    ) -> None:
         self.task = task
         self.nornir = nornir
         self.name = name or task.__name__
@@ -214,7 +214,7 @@ def __init__(
         exception: Optional[BaseException] = None,
         severity_level: int = DEFAULT_SEVERITY_LEVEL,
         **kwargs: Any,
-    ):
+    ) -> None:
         self.result = result
         self.host = host
         self.changed = changed
@@ -246,7 +246,7 @@ class MultiResult(List[Result]):
     a particular device/task.
     """
 
-    def __init__(self, name: str):
+    def __init__(self, name: str) -> None:
         self.name = name
 
     def __getattr__(self, name: str) -> Any:
@@ -280,7 +280,7 @@ class AggregatedResult(Dict[str, MultiResult]):
     You can access each individual result by doing ``my_aggr_result["hostname_of_device"]``.
     """
 
-    def __init__(self, name: str, **kwargs: MultiResult):
+    def __init__(self, name: str, **kwargs: MultiResult) -> None:
         self.name = name
         super().__init__(**kwargs)
 

pyproject.toml

@@ -150,7 +150,6 @@ ignore = [
 # like this so that we can reactivate them one by one. Alternatively ignored after further       #
 # investigation if they are deemed to not make sense.                                            #
 ##################################################################################################
-    "ANN204",  # Missing return type annotation for special method `__init__`
     "ANN401",  # Dynamically typed expressions (typing.Any) are disallowed
     "ARG002",  # Unused method argument
     "B028",    # No explicit `stacklevel` keyword argument found

tests/core/test_InitNornir.py

@@ -45,7 +45,7 @@ def transform_func_with_options(host, a):
 
 
 class InventoryTest:
-    def __init__(self, *args, **kwargs):
+    def __init__(self, *args, **kwargs) -> None:
         pass
 
     def load(self):