hotfix: Solve Python typing errors (#9)

Author: electricalgorithm

core/observers/subject/base_subject.py

@@ -50,7 +50,6 @@ def set_state(self, state: ObserverStates) -> None:
         self.notify()
 
     @abstractmethod
-    @staticmethod
     def get_default_state() -> ObserverStates:
         """This method is called when the observer is updated."""
         raise NotImplementedError

core/observers/subject/eye_subject.py

@@ -7,6 +7,7 @@
 from datetime import datetime
 from threading import Lock
 from time import sleep
+from typing import Optional
 
 import cv2
 
@@ -56,7 +57,7 @@ def _cb_save(self, future) -> None:
 
     def run(self,
             eye_strategy: BaseEyeStrategy,
-            wifi_lock: Lock | None = None
+            wifi_lock: Optional[Lock] = None
             ) -> None:
         """This method is called when the observer is updated."""
         thread = ThreadPoolExecutor(
@@ -65,9 +66,10 @@ def run(self,
         ).submit(self._run_in_loop, self, eye_strategy, wifi_lock)
         thread.add_done_callback(self._cb_save)
 
+    @staticmethod
     def _run_in_loop(self,
                      eye_strategy: BaseEyeStrategy,
-                     wifi_lock: Lock | None = None
+                     wifi_lock: Optional[Lock] = None
                      ) -> None:
         """This method is called when the observer is updated."""
         logger.debug("[EyeSubject] Thread is started.")

core/observers/subject/wifi_subject.py

@@ -5,6 +5,7 @@
 from concurrent.futures import ThreadPoolExecutor
 from threading import Lock
 from time import sleep
+from typing import Optional
 
 from core.observers.subject.base_subject import BaseSubject
 from core.strategies.wifi.base_wifi_strategy import BaseWiFiStrategy
@@ -20,7 +21,7 @@ class WiFiSubject(BaseSubject):
     This class inherits from IBaseSubject.
     Concretes a subject for WiFiS features.
     """
-    SINGLETON_LOCK: Lock | None = None
+    SINGLETON_LOCK: Optional[Lock] = None
     CHECK_INTERVAL: int = 5
 
     @staticmethod

core/strategies/detectors/efficientdet_strategy.py

@@ -5,9 +5,10 @@
 
 import cv2
 import numpy
-from base_detector_strategy import BaseDetectorStrategy, DetectorResult
 from tflite_runtime.interpreter import Interpreter
 
+from .base_detector_strategy import BaseDetectorStrategy, DetectorResult
+
 
 class EfficientdetStrategy(BaseDetectorStrategy):
     """