changing class variable using class and an instance.

ammarlodhi255 · ammarlodhi255 · commit d8fcaaa20a05 · 2023-01-05T16:37:18.000+05:00
diff --git a/OOP/class_variables.py b/OOP/class_variables.py
@@ -15,10 +15,32 @@ def show_num_of_chairs(self):
         print(Car.num_of_chairs)  # Access class variable
 
 
-car = Car('blue', 'OP90', '190mph')
+car_1 = Car('blue', 'OP90', '190mph')
+car_2 = Car('brown', 'I8', '100mph')
 # Let us see the instance variable of this object:
-print(car.__dict__)
+print(car_1.__dict__)
 
 print(Car.num_of_chairs)
 # The instance will first check whether it has the 'num_of_chairs; instance variable, then it checks whether it is a class variable
-print(car.num_of_chairs)
+print(car_1.num_of_chairs)
+print()
+
+# Following is interesting:
+
+# If we change num_of_chairs using the class:
+Car.num_of_chairs = 5
+
+print(Car.num_of_chairs)
+print(car_1.num_of_chairs)
+print(car_2.num_of_chairs)
+print()
+
+# But if I change using one of the instances:
+car_1.num_of_chairs = 4
+
+print(Car.num_of_chairs)
+print(car_1.num_of_chairs)
+print(car_2.num_of_chairs)
+
+# This is because the line 'car_1.num_of_chairs = 4' creates a new instance variable for the object car_1
+print(car_1.__dict__)
