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#
Authors:
Tony Gaddis
Chapter:
Inheritance
Exercise:
Checkpoint
Question:5 | ISBN:9780132576376 | Edition: 2

Question

Look at the following class definitions:
class Vegetable:
    def __init__(self, vegtype):
         self.__vegtype = vegtype
    def message(self):
         print("I'm a vegetable.")
class Potato(Vegetable):
    def __init__(self):
         Vegetable.__init__(self, 'potato')
    def message(self):
         print("I'm a potato.")
Given these class definitions, what will the following statements display?
v = Vegetable('veggie')
p = Potato()
v.message()
p.message()

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Answer

The output of the given code is as follows:

I'm a vegetable.
I'm a potato.

Explanation:

  • v = Vegetable('veggie'): This creates an instance of the Vegetable class with the vegtype attribute set to 'veggie'.
  • p = Potato(): This creates an instance of the Potato class. Since Potato is a subclass of Vegetable, the __init__ method of Potato calls the __init__ method of the parent class Vegetable and passes 'potato' as the vegtype argument.
  • v.message(): This calls the message() method on the v instance of Vegetable. The message() method of the Vegetable class is executed, which prints "I'm a vegetable."
  • p.message(): This calls the message() method on the p instance of Potato. Since Potato is a subclass of Vegetable and has its own message() method, the message() method of the Potato class is executed, which prints "I'm a potato.

Finally, the output of the given statements will be "I'm a vegetable." and "I'm a potato." respectively.

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