class Car(): # Define Car def init(self, model='Ford', wheels=4): # Initialize by default as 4-wheel Ford self.model = model # self.model string set to 'Ford' or entered model self.running = False # self.running boolean initially set to False if wheels < 0: # Test for negative wheels (a common automotive defect) print 'Your car has negative wheels? What the hell? Resetting to 0.' wheels = 0 # Corrects problem elif wheels < 4: print 'You do realize your car has fewer than 4 wheels? Where are you going to go on %i wheels?' % wheels # prints out snarky comment self.wheels = wheels # Subtly different due to relation to Car class def start(self): # Defines function for items in Car class if self.running != True: # Tests that car is not already running print 'The car started!' self.running = True # If not, starts it else: print 'The car is already running!' def stop(self): if self.running == True: # Tests that car is running print 'The car stopped!' self.running = False # Stops all that else: print 'The car was not running!'
ford = Car() nissan = Car(model = 'Nissan') ford.running ford.start() ford.stop() nissan.running nissan.stop() ford = Car(wheels = 4) ford.stop() car was not running! toyota = Car(wheels=3) toyota = Car(wheels=-2)