Add Abstract Class examples

returnvalue · returnvalue · commit f2883f12af6c · 2020-09-10T10:09:15.000-04:00
diff --git a/README.md b/README.md
@@ -34,3 +34,4 @@ files, and the full tutorial for each collection of code is available below. 
 27. [Instance Methods And Attributes](https://vegibit.com/python-instance-methods-and-attributes/)
 28. [How To Use type() And isinstance()](https://vegibit.com/how-to-use-type-and-isinstance-in-python/)
 29. [Basic Python Inheritance](https://vegibit.com/basic-python-inheritance/)
+30. [Abstract Base Classes](https://vegibit.com/python-abstract-base-classes/)
diff --git a/abstractclass.py b/abstractclass.py
@@ -0,0 +1,75 @@
+# Simple Class With Inheritance
+class Vehicle:
+    def __init__(self):
+        super().__init__()
+
+    def go_forward(self):
+        print('Driving forward.')
+
+
+class Car(Vehicle):
+    def __init__(self):
+        super().__init__()
+
+
+class Truck(Vehicle):
+    def __init__(self):
+        super().__init__()
+
+
+vehicle1 = Vehicle()
+
+car1 = Car()
+car1.go_forward()
+
+truck1 = Truck()
+truck1.go_forward()
+
+# Adding Abstract Base Class
+from abc import ABC, abstractmethod
+
+
+class Vehicle(ABC):
+    def __init__(self):
+        super().__init__()
+
+    @abstractmethod
+    def go_forward(self):
+        pass
+
+
+# Adding A Subclass
+class Car(Vehicle):
+    def __init__(self, press_accelerator):
+        super().__init__()
+        self.press_accelerator = press_accelerator
+
+    def go_forward(self):
+        if self.press_accelerator:
+            print('Driving forward')
+        else:
+            print('Press the accelerator to drive forward')
+
+
+car1 = Car(True)
+car1.go_forward()
+
+
+# A Second Subclass
+class Truck(Vehicle):
+    def __init__(self, press_accelerator):
+        super().__init__()
+        self.press_accelerator = press_accelerator
+
+    def go_forward(self):
+        if self.press_accelerator:
+            print('Driving forward')
+        else:
+            print('Press the accelerator to drive forward')
+
+
+truck1 = Truck(False)
+truck1.go_forward()
+
+truck2 = Truck(True)
+truck2.go_forward()
