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Python Object-Oriented Python (retired) Inheritance Override Inherited Methods

Posted by Douglas Ngwenya
Douglas Ngwenya
3,132 Points

Please help Why does it still get lower case when I have infused upper case all over?

Challenge Task 3 of 3

Animal.noise() returns self.sound.lower(). Make Sheep.noise() return the uppercased version of the instance's sound.

Why does it return expected "SNEEZE" but got "sneeze"? Surely I have put lots of upper() all over. Is there a bug in this task?

sheep.py 
from animal import Animal
class Sheep(Animal):

    sound = "SNEEZE".upper()
def __init__(self, sound):
    self.sound = 'SNEEZE'.upper
    return self.sound.upper()

2 Answers

Chris Freeman
MOD
Chris Freeman
Treehouse Moderator 68,423 Points
Chris Freeman
Chris Freeman
Treehouse Moderator 68,423 Points

The key here is inheritance. The challenge checker is running Sheep.noise() to get the sound. If there is not a method name noise() in Sheep, it will try to run the inherited method from the parent class. This is Animal.noise() which returns self.sound.lower().

To solve the challenge, create a Sheep method noise which will override the inherited Animal.noise(). It is in the Sheep.noise() that you use the upper() method to get the result you are looking for.

Post back if you have more questions. Good Luck!!!

Douglas Ngwenya
Douglas Ngwenya
3,132 Points

I tried all sort of things including this:

from animal import Animal
class Sheep(Animal):
    pass
    sound = "SNEEZE".upper()
def __init__(Sheep, noise):
    Sheep.noise = 'SNEEZE'.upper
    return Sheep.noise.upper()

It still fails

Douglas Ngwenya
Douglas Ngwenya
3,132 Points
Douglas Ngwenya
Douglas Ngwenya
3,132 Points

Finally:

from animal import Animal

class Sheep(Animal):
    sound = 'roar'

    def noise(self):
        return self.sound.upper()
Douglas Ngwenya
Douglas Ngwenya
3,132 Points

It is not making sense at all, but it worked!!