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Python Basic Object-Oriented Python Welcome to OOP Adding to our Panda

Posted by fionaj
fionaj
1,380 Points

I am not sure what this code challenge wants me to do.

I am confused on how to return a string that says 'Bao Bao eats bamboo.' where 'Bao Bao' is the name attribute and 'bamboo' is the food attribute.

panda.py 
class Panda:
    species = 'Ailuropoda melanoleuca'
    food = 'bamboo'

    def __init__(self, name, age):
        self.is_hungry = True
        self.name = name
        self.age = age

    def eat(self):
        is_hungry = False

        print("Bao Bao eats bamboo.")

2 Answers

Asher Orr
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.a{fill-rule:evenodd;}techdegree seal-36
Asher Orr
Python Development Techdegree Graduate 9,409 Points
Asher Orr
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Asher Orr
Python Development Techdegree Graduate 9,409 Points

Hi Fiona!

When you click "Check Work," the Treehouse checker makes an instance of your Panda class. It runs code like this: 

treehouse_checkers_instance = Panda('Bao Bao', '17')

Here's how it parses your code:

class Panda:
    species = 'Ailuropoda melanoleuca'
    #ok, the species attribute of ANY instance of the Panda class is 'Ailuropoda melanoleuca'
    #self.species will always be 'Ailuropoda melanoleuca'
    food = 'bamboo'
    #ok, the food attribute of ANY instance of the Panda class will be 'bamboo'.
    #self.food will always be 'bamboo.'

    def __init__(self, name, age):
        self.is_hungry = True
        self.name = name
       #when treehouse_checkers_instance was created, I set the name attribute to 'Bao Bao'
       #for this instance, self.name is 'Bao Bao'.
        self.age = age
       #when treehouse_checkers_instance was created, I set the age attribute to '17'
       #for this instance, self.name is '17'.

Then it calls the eat method. Like this:

treehouse_checkers_instance = Panda('Bao Bao', '17')
treehouse_checkers_instance.eat()

The eat method should change the is_hungry attribute to False. It should also return the string 'Bao Bao eats bamboo.'

Look at line 2 in your eat method:

    def eat(self):
        is_hungry = False
        print("Bao Bao eats bamboo.")

All instance attributes need the "self." prefix. 

self.is_hungry = False
#the line above actually means:
treehouse_checkers_instance.is_hungry = False

Here's how to fix the last line:

  • Make sure you return the string (rather than printing it.)
  • Format the string to hold the name and food attributes.

I hope this helps. Let me know if you have questions!

fionaj
fionaj
1,380 Points

Hello thanks for help me out. I understand what to do now, but I am unsure what "Also, return a string that says 'Bao Bao eats bamboo.' where 'Bao Bao' is the name attribute and 'bamboo' is the food attribute." is supposed to mean. Am i supposed to create a food attribute?

Steven Parker
Steven Parker
231,236 Points
Steven Parker
Steven Parker
231,236 Points

The string 'Bao Bao eats bamboo.' is simply an example to show the expected output formatting. The challenge wants you to construct the message using the name attribute that was stored during instance creation (which would most likely be something other than 'Bao Bao') and the food attribute in the class definition.

Also note that the instructions say to return the string instead of printing it.

Finally, remember that when referring to class or instance attributes, use the prefix self..

Steven Parker
Steven Parker
231,236 Points
Steven Parker
Steven Parker
231,236 Points

Hi again, fionaj,

The food attribute is already part of the class, defined on this line:

    food = 'bamboo'

So you don't need to create it, just refer to it when you are building the formatted string. An example of using the name attribute in a string might look like this:

    print(f"{self.name} is my name!")

Just remember that for this challenge you will be return‍ing the string and not printing it, and you need to use both the name and food attributes to make a string that looks like the example.