refactoring move Singleton class to separate file

src/database/Connector.py

 from sqlalchemy import create_engine
 from sqlalchemy.orm import sessionmaker
 from scrapy.conf import settings
-
-
-class Singleton(type):
-    _instances = {}
-    def __call__(cls, *args, **kwargs):
-        if cls not in cls._instances:
-            cls._instances[cls] = super(Singleton, cls).__call__(*args, **kwargs)
-        return cls._instances[cls]
+from utils.Singleton import Singleton
 
 
 class Connector(metaclass=Singleton):

src/utils/Singleton.py

+
+
+class Singleton(type):
+    _instances = {}
+
+    def __call__(cls, *args, **kwargs):
+        if cls not in cls._instances:
+            cls._instances[cls] = super(Singleton, cls).__call__(*args, **kwargs)
+        return cls._instances[cls]
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