#[28] - [Python]

Author: Jairo-Alejandro

Roadmap/28 - SOLID LSP/python/Jairo-Alejandro.py

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+"""
+Principio SOLID de Sustitución de Liskov (Liskov Substitution Principle, LSP)
+
+Si se tiene una clase base y una subclase que hereda la clase base , se debe poder usar la subclase sin afectar el programa 
+"""
+# Ejemplo incorrecto
+class Animal():
+
+    def fly(self):
+        pass
+
+class Bird(Animal):
+
+    def fly(self):
+        print("the bird is fly")
+
+class Penguin(Animal):
+
+    def fly(self):
+        raise Exception("the penguin can't fly")
+
+def fly_animal(animal: Animal):
+    animal.fly()
+
+my_bird = Bird()
+my_penguin = Penguin()
+
+#fly_animal(my_bird)
+#fly_animal(my_penguin)
+
+# Ejemplo correcto 
+
+class Animal():
+    def move(self):
+        pass
+
+class can_fly():
+    def fly(self):
+        pass
+
+class Bird(Animal, can_fly):
+    def move(self):
+        print("The Bird is moving")
+
+    def fly(self):
+        print("The Bird is fly")
+
+class Penguin(Animal):
+    def move(self):
+        print("The penguin is moving")
+
+def move_animal(animal: Animal):
+    animal.move()
+
+def fly_animal(animal: can_fly):
+    animal.fly()
+
+my_bird = Bird()
+my_penguin = Penguin()
+
+move_animal(my_bird)
+move_animal(my_penguin)
+
+fly_animal(my_bird)
+
+# Dificultad extra 
+
+class Vehicle():
+
+    def accelerate(self):
+        pass
+
+    def brake(self):
+        pass
+
+class Car(Vehicle):
+
+    def accelerate(self):
+        print("the car is accelerate")
+
+    def brake(self):
+        print("the car is braking")
+
+class Bicycle(Vehicle):
+
+    def accelerate(self):
+        print("the Bicycle is accelerate")
+    
+    def brake(self):
+        print("the Bicycle is braking")
+
+class Motorcycle(Vehicle):
+
+    def accelerate(self):
+        print("the Motorcycle is accelerate")
+    
+    def brake(self):
+        print("the Motorcycle is braking")
+
+def test_vehicle(vehicle: Vehicle):
+    vehicle.accelerate()
+    vehicle.brake()
+
+my_car = Car()
+my_bicycle = Bicycle()
+my_motorcycle = Motorcycle()
+
+test_vehicle(my_car)
+test_vehicle(my_bicycle)
+test_vehicle(my_motorcycle)
+