19.12. Multiple Choice Questions for Multiple Classes

Q-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

Q-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.

Q-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.

Q-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.

Q-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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