Added abstraction class to make sure base classes implement the necessary function

python/item.py

@@ -1,21 +1,25 @@
+from abc import ABC, abstractmethod
+
 from python.helper import decrease_quality, increase_quality
 
 
-class Item:
+class Item(ABC):
-    def __init__(self, name, sell_in, quality):
-        self.name = name
-        self.sell_in = sell_in
-        self.quality = quality
 
+    @abstractmethod
+    def __init__(self):
+        pass
+
+    @abstractmethod
     def update_quality(self):
         """Update the quality of an item"""
         pass
 
-    def __repr__(self):
-        return "%s, %s, %s" % (self.name, self.sell_in, self.quality)
-
 
 class RegularItem(Item):
+    def __init__(self, name, sell_in, quality):
+        self.name = name
+        self.sell_in = sell_in
+        self.quality = quality
 
     def update_quality(self):
         """Update the quality of an item"""
@@ -24,12 +28,20 @@ class RegularItem(Item):
 
 
 class Sulfuras(Item):
+    def __init__(self, name, sell_in, quality):
+        self.name = name
+        self.sell_in = sell_in
+        self.quality = quality
 
     def update_quality(self):
         pass
 
 
 class Backstage(Item):
+    def __init__(self, name, sell_in, quality):
+        self.name = name
+        self.sell_in = sell_in
+        self.quality = quality
 
     def update_quality(self):
         if self.sell_in <= 0:
@@ -40,11 +52,14 @@ class Backstage(Item):
             self.quality = increase_quality(quality=self.quality, increase_quality_by=2)
         else:
             self.quality = increase_quality(quality=self.quality)
-
         self.sell_in = self.sell_in - 1
 
 
 class AgedBrie(Item):
+    def __init__(self, name, sell_in, quality):
+        self.name = name
+        self.sell_in = sell_in
+        self.quality = quality
 
     def update_quality(self):
         self.quality = increase_quality(quality=self.quality)
@@ -52,6 +67,10 @@ class AgedBrie(Item):
 
 
 class Conjured(Item):
+    def __init__(self, name, sell_in, quality):
+        self.name = name
+        self.sell_in = sell_in
+        self.quality = quality
 
     def update_quality(self):
         self.quality = decrease_quality(quality=self.quality, sell_in=self.sell_in, decrease_quality_by=2)