19.12. Multiple Choice Questions for Multiple ClassesΒΆ
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-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.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-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
- 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-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
- 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-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
- Correct! It is an object attribute.
- object method
- It is not 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"