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utils.py

@@ -1,11 +1,7 @@
-import abc
 
-class Singleton(abc.ABC):
+class Singleton(type):
     _instances = {}
-
-    def __new__(cls, *args, **kwargs):
+    def __call__(cls, *args, **kwargs):
         if cls not in cls._instances:
-            cls._instances[cls] = super(Singleton, cls).__new__(cls)
-        return cls._instances[cls]
-    
-
+            cls._instances[cls] = super(Singleton, cls).__call__(*args, **kwargs)
+        return cls._instances[cls]