Chapter End

Author: Hridoy-31

9. Classes/car.py

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+"""A class that can be used to represent a car."""
+
+class Car():
+    """A simple attempt to represent a car."""
+
+    def __init__(self, manufacturer, model, year):
+        """Initialize attributes to describe a car."""
+        self.manufacturer = manufacturer
+        self.model = model
+        self.year = year
+        self.odometer_reading = 0
+        
+    def get_descriptive_name(self):
+        """Return a neatly formatted descriptive name."""
+        long_name = str(self.year) + ' ' + self.manufacturer + ' ' + self.model
+        return long_name.title()
+    
+    def read_odometer(self):
+        """Print a statement showing the car's mileage."""
+        print("This car has " + str(self.odometer_reading) + " miles on it.")
+        
+    def update_odometer(self, mileage):
+        """
+        Set the odometer reading to the given value.
+        Reject the change if it attempts to roll the odometer back.
+        """
+        if mileage >= self.odometer_reading:
+            self.odometer_reading = mileage
+        else:
+            print("You can't roll back an odometer!")
+    
+    def increment_odometer(self, miles):
+        """Add the given amount to the odometer reading."""
+        self.odometer_reading += miles

9. Classes/dog.py

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+class Dog():
+    """A simple attempt to model a dog."""
+    
+    def __init__(self, name, age):
+        """Initialize name and age attributes."""
+        self.name = name
+        self.age = age
+        
+    def sit(self):
+        """Simulate a dog sitting in response to a command."""
+        print(self.name.title() + " is now sitting.")
+
+    def roll_over(self):
+        """Simulate rolling over in response to a command."""
+        print(self.name.title() + " rolled over!")
+        
+
+my_dog = Dog('willie', 6)
+your_dog = Dog('lucy', 3)
+
+print("My dog's name is " + my_dog.name.title() + ".")
+print("My dog is " + str(my_dog.age) + " years old.")
+my_dog.sit()
+
+print("\nMy dog's name is " + your_dog.name.title() + ".")
+print("My dog is " + str(your_dog.age) + " years old.")
+your_dog.sit()

9. Classes/electric_car.py

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+"""A set of classes that can be used to represent electric cars."""
+
+from car import Car
+
+class Battery():
+    """A simple attempt to model a battery for an electric car."""
+
+    def __init__(self, battery_size=60):
+        """Initialize the batteery's attributes."""
+        self.battery_size = battery_size
+
+    def describe_battery(self):
+        """Print a statement describing the battery size."""
+        print("This car has a " + str(self.battery_size) + "-kWh battery.")  
+        
+    def get_range(self):
+        """Print a statement about the range this battery provides."""
+        if self.battery_size == 60:
+            range = 140
+        elif self.battery_size == 85:
+            range = 185
+            
+        message = "This car can go approximately " + str(range)
+        message += " miles on a full charge."
+        print(message)
+    
+        
+class ElectricCar(Car):
+    """Models aspects of a car, specific to electric vehicles."""
+
+    def __init__(self, manufacturer, model, year):
+        """
+        Initialize attributes of the parent class.
+        Then initialize attributes specific to an electric car.
+        """
+        super().__init__(manufacturer, model, year)
+        self.battery = Battery()

9. Classes/favorite_languages.py

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+from collections import OrderedDict
+
+favorite_languages = OrderedDict()
+
+favorite_languages['jen'] = 'python'
+favorite_languages['sarah'] = 'c'
+favorite_languages['edward'] = 'ruby'
+favorite_languages['phil'] = 'python'
+
+for name, language in favorite_languages.items():
+    print(name.title() + "'s favorite language is " +
+        language.title() + ".")

9. Classes/my_car.py

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+from car import Car
+
+my_new_car = Car('audi', 'a4', 2015)
+print(my_new_car.get_descriptive_name())
+
+my_new_car.odometer_reading = 23
+my_new_car.read_odometer()

9. Classes/my_cars.py

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+from car import Car
+from electric_car import ElectricCar
+
+my_beetle = Car('volkswagen', 'beetle', 2015)
+print(my_beetle.get_descriptive_name())
+
+my_tesla = ElectricCar('tesla', 'roadster', 2015)
+print(my_tesla.get_descriptive_name())