Classes & Instances

Preview — 3 of 10 questions

What is the output of the following code?

javascript

class ShoppingCart:
    items = []

    def add(self, item):
        self.items.append(item)

cart1 = ShoppingCart()
cart2 = ShoppingCart()
cart1.add("apple")
cart2.add("banana")
print(cart1.items)
print(cart2.items)

A['apple'] then ['apple', 'banana']

B['apple'] then ['banana']

C['apple', 'banana'] then ['apple', 'banana']

D[] then ['banana']

What is the output of the following code?

javascript

class Dog:
    def __init__(self, name):
        self.name = name

    def bark(self):
        return f"{self.name} says woof"

d = Dog("Rex")
print(d.bark())
print(Dog.bark(d))

ARex says woof then Rex says woof

BRex says woof then TypeError

CRex says woof then AttributeError

DTypeError then Rex says woof

What is the output of the following code?

javascript

class Temperature:
    def __init__(self, celsius):
        self.celsius = celsius

    @staticmethod
    def is_freezing(celsius):
        return celsius <= 0

    @classmethod
    def from_fahrenheit(cls, fahrenheit):
        return cls((fahrenheit - 32) * 5 / 9)

t = Temperature.from_fahrenheit(32)
print(round(t.celsius))
print(Temperature.is_freezing(-5))

ATypeError

B32 then True

C0 then False

D0 then True

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