ch06

ch06/oop/class.issubclass.isinstance.py

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+# oop/class.issubclass.isinstance.py
+from class_inheritance import Car, RaceCar, F1Car
+
+
+car = Car()
+racecar = RaceCar()
+f1car = F1Car()
+cars = [(car, 'car'), (racecar, 'racecar'), (f1car, 'f1car')]
+car_classes = [Car, RaceCar, F1Car]
+
+for car, car_name in cars:
+    for class_ in car_classes:
+        belongs = isinstance(car, class_)
+        msg = 'is a' if belongs else 'is not a'
+        print(car_name, msg, class_.__name__)
+
+""" Prints:
+Starting engine Engine for car Car... Wroom, wroom!
+Starting engine V8Engine for car RaceCar... Wroom, wroom!
+Starting engine ElectricEngine for car CityCar... Wroom, wroom!
+Starting engine V8Engine for car F1Car... Wroom, wroom!
+car is a Car
+car is not a RaceCar
+car is not a F1Car
+racecar is a Car
+racecar is a RaceCar
+racecar is not a F1Car
+f1car is a Car
+f1car is a RaceCar
+f1car is a F1Car
+"""
+
+print('-' * 60)
+
+for class1 in car_classes:
+    for class2 in car_classes:
+        is_subclass = issubclass(class1, class2)
+        msg = '{0} a subclass of'.format(
+            'is' if is_subclass else 'is not')
+        print(class1.__name__, msg, class2.__name__)
+
+""" Prints:
+Car is a subclass of Car
+Car is not a subclass of RaceCar
+Car is not a subclass of F1Car
+RaceCar is a subclass of Car
+RaceCar is a subclass of RaceCar
+RaceCar is not a subclass of F1Car
+F1Car is a subclass of Car
+F1Car is a subclass of RaceCar
+F1Car is a subclass of F1Car
+"""