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Exercise 3

Create a mix-in for the Car and Truck classes from the previous exercise that lets you operate the turn signals: signal left, signal right, and signal off. Use the following code to test your code.

car1.signal_left()       # Signalling left
truck1.signal_right()    # Signalling right
car1.signal_off()        # Signal is now off
truck1.signal_off()      # Signal is now off
boat1.signal_left()
# AttributeError: 'Boat' object has no attribute
# 'signal_left'

Solution

#highlight
class SignalMixin:

    def signal_left(self):
        print('Signalling left')

    def signal_right(self):
        print('Signalling right')

    def signal_off(self):
        print('Signal is now off')
#endhighlight

# Vehicle class omitted for brevity

#highlight
class Car(SignalMixin, Vehicle):
#endhighlight

    def __init__(self):
        super().__init__()

#highlight
class Truck(SignalMixin, Vehicle):
#endhighlight

    def __init__(self):
        super().__init__()

# Remaining code omitted for brevity

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