Solve linter error

2ykwang · 2ykwang · commit d3d00e5809b9 · 2021-12-08T05:42:00.000+09:00
diff --git a/patterns/behavioral/observer.py b/patterns/behavioral/observer.py
@@ -12,7 +12,7 @@
 from __future__ import annotations
 
 from contextlib import suppress
-from typing import List, Optional, Protocol
+from typing import Protocol
 
 
 # define a generic observer type
@@ -23,7 +23,7 @@ def update(self, subject: Subject) -> None:
 
 class Subject:
     def __init__(self) -> None:
-        self._observers: List[Observer] = []
+        self._observers: list[Observer] = []
 
     def attach(self, observer: Observer) -> None:
         if observer not in self._observers:
@@ -33,7 +33,7 @@ def detach(self, observer: Observer) -> None:
         with suppress(ValueError):
             self._observers.remove(observer)
 
-    def notify(self, modifier: Optional[Observer] = None) -> None:
+    def notify(self, modifier: Observer | None = None) -> None:
         for observer in self._observers:
             if modifier != observer:
                 observer.update(self)
diff --git a/patterns/behavioral/state.py b/patterns/behavioral/state.py
@@ -18,7 +18,7 @@ def scan(self):
         self.pos += 1
         if self.pos == len(self.stations):
             self.pos = 0
-        print("Scanning... Station is {} {}".format(self.stations[self.pos], self.name))
+        print(f"Scanning... Station is {self.stations[self.pos]} {self.name}")
 
 
 class AmState(State):
diff --git a/patterns/behavioral/strategy.py b/patterns/behavioral/strategy.py
@@ -10,7 +10,7 @@
 
 from __future__ import annotations
 
-from typing import Callable, Type
+from typing import Callable
 
 
 class DiscountStrategyValidator:  # Descriptor class for check perform
@@ -36,7 +36,7 @@ def __set__(self, obj: Order, value: Callable = None) -> None:
         else:
             setattr(obj, self.private_name, None)
 
-    def __get__(self, obj: object, objtype: Type = None):
+    def __get__(self, obj: object, objtype: type = None):
         return getattr(obj, self.private_name)
 
 
diff --git a/patterns/creational/prototype.py b/patterns/creational/prototype.py
@@ -22,7 +22,7 @@
 """
 from __future__ import annotations
 
-from typing import Any, Dict
+from typing import Any
 
 
 class Prototype:
@@ -43,7 +43,7 @@ class PrototypeDispatcher:
     def __init__(self):
         self._objects = {}
 
-    def get_objects(self) -> Dict[str, Prototype]:
+    def get_objects(self) -> dict[str, Prototype]:
         """Get all objects"""
         return self._objects
 
diff --git a/patterns/fundamental/delegation_pattern.py b/patterns/fundamental/delegation_pattern.py
@@ -8,7 +8,7 @@
 
 from __future__ import annotations
 
-from typing import Any, Callable, Union
+from typing import Any, Callable
 
 
 class Delegator:
@@ -31,7 +31,7 @@ class Delegator:
     def __init__(self, delegate: Delegate):
         self.delegate = delegate
 
-    def __getattr__(self, name: str) -> Union[Any, Callable]:
+    def __getattr__(self, name: str) -> Any | Callable:
         attr = getattr(self.delegate, name)
 
         if not callable(attr):
