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Section 19.12 Multiple Choice Questions for Multiple Classes

Activity 19.12.1.

Given the Point class below. What are the object methods in the Point class? Pick all that apply. 
class Point:

    def __init__(self, initX, initY):
        """ Create a new point at the given coordinates. """
        self.x = initX
        self.y = initY

    def distanceFromOrigin(self):
        return ((self.x ** 2) + (self.y ** 2)) ** 0.5

    def __str__(self):
        return f"x = {self.x}, y = {self.y}"

    def halfway(self, target):
        mx = (self.x + target.x) / 2
        my = (self.y + target.y) / 2
        return Point(mx, my)
  • self.x
  • This stores the x position for the point. It is an object attribute.
  • self.distanceFromOrigin
  • This is an object method in the Point class
  • self.y
  • This stores the y position for the point. It is an object attribute.
  • self.halfway
  • This is an object method in the Point class

Activity 19.12.2.

Given the code below, what are the object attribute(s) in the Rectangle class? Pick all that apply. 
class Rectangle:

    def __init__(self, p1, p2):
        """ Create a new rectangle with the given points """
        self.p1 = p1
        self.p2 = p2

    def area(self):
        """ Return the area of the rectangle """
        width = abs(self.p1.x - self.p2.x)
        height = abs(self.p1.y - self.p2.y)
        return width * height
  • self.p1
  • This is an object attribute in the Rectangle class.
  • self.__init__
  • This is an object method in the Rectangle class.
  • self.p2
  • This is an object attribute in the Rectangle class.
  • self.area
  • This is an object method in the Rectangle class.

Activity 19.12.3.

Given the following code, what is breeds? 
class Dog:

    breeds = ["Bulldog", "Poodle", "Chihuahua", "Dachshund"]

    def __init__(self, name, breed):
        self.name = name
        if breed not in Dog.breeds:
            Dog.breeds.append(breed)
        self.breed_index = Dog.breeds.index(breed)

    def speak(self):
        return "bark"
  • class attribute
  • Correct! It is a class attribute (only exists in the class).
  • class method
  • It is not a class method.
  • object attribute
  • It is not an object attribute.
  • object method
  • It is not an object method.

Activity 19.12.4.

Given the following code, what is speak? 
class Dog:

    breeds = ["Bulldog", "Poodle", "Chihuahua", "Dachshund"]

    def __init__(self, name, breed):
        self.name = name
        if breed not in Dog.breeds:
            Dog.breeds.append(breed)
        self.breed_index = Dog.breeds.index(breed)

    def speak(self):
        return "bark"
  • class attribute
  • It is not a class attribute.
  • class method
  • It is not a class method.
  • object attribute
  • It is not an object attribute.
  • object method
  • Correct! It is an object method.

Activity 19.12.5.

Given the following code, what is self.breed_index? 
class Dog:

    breeds = ["Bulldog", "Poodle", "Chihuahua", "Dachshund"]

    def __init__(self, name, breed):
        self.name = name
        if breed not in Dog.breeds:
            Dog.breeds.append(breed)
        self.breed_index = Dog.breeds.index(breed)

    def speak(self):
        return "bark"
  • class attribute
  • It is not a class attribute.
  • class method
  • It is not a class method.
  • object attribute
  • Correct! It is an object attribute.
  • object method
  • It is not an object method.
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