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

daniel refael
daniel refael
1,679 Points
Posted by daniel refael
daniel refael
1,679 Points

Hi, how can I return the string, and which way? did I just need to write the sentence?

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):
        self.is_hungry = False
        self.name = 'Bao Bao'
        str = self.name + 'eats' + Panda.food
        return str

3 Answers

Caleb Kemp
Caleb Kemp
12,755 Points
Caleb Kemp
Caleb Kemp
12,755 Points

So, it is looking for the answer in a very particular format, something as small as an extra space, or no space where it was expecting one, will cause it to fail.

The def eat(self): method should only have two lines of code.

  1. set value of is_hungry (which looks good on yours)
  2. return statement using formatted string.

Here is an example of what formatted string looks like

return (f'{self.var1} text {self.var2}')

At minute 2:00 here is where the teacher demonstrates printing a formatted string.

I know it's super annoying, but make sure you get it to print out the challenge text exactly. Since you can't see the output of your code in the challenge, and the hints aren't always super helpful, I find it sometimes helps to first complete the challenge in the workspace. That way you know it works, and you just need to play around with the formatting, versus wondering if there is actually something wrong or a typo that is causing it to fail. Hope that helps :smile:

P.S. One more thing, although in this case it will print the same result, use "self.food", NOT "Panda.food", since the challenge is expecting "self.food", using "Panda.food" will cause it to fail.

Steven Parker
Steven Parker
231,275 Points
Steven Parker
Steven Parker
231,275 Points

There are several issues here:

  • the method should not change the value of self.name
  • the string eats needs spaces to separate it from the name and food
  • a class should not refer to itself by name (like Panda.food), but by using the keyword self
  • the output string should end with a period (.)

But according to the error message, even fixing these errors isn't enough. The challenge is looking for code that builds the output as a formatted string ("f"-string) and returns it without creating another variable. So apparently, this exact line must be used for building and returning the result:

        return f"{self.name} eats {self.food}."

If you consider this a bug in the challenge (I would), you may want to report this to Support. If they agree, it will get you a "special Exterminator badge". :beetle:

Caleb Kemp
Caleb Kemp
12,755 Points
Caleb Kemp
Caleb Kemp
12,755 Points

I remember when it seemed like most challenges were like that, where the code had to be in an exact format down to the spacing, for example

var  x = 5;

would fail for

var x = 5;

I remember one particular JavaScript challenge which left me stumped for hours. I had built and confirmed that the code was functioning exactly as intended. The challenge wasn't giving me an "expecting grep" statement, and I was convinced mine was formatted identically like the example. What was the problem? I had used "tabs" to create the spacing, the challenge (while visually the same), was expecting exactly 3 "space" characters everywhere I had used the tab key. Doing the challenges I remember always thinking, I'm not sure if this challenge is super helpful in helping me learn language x, but it certainly is making me more proficient at reading grep statements lol :smile: I don't miss the old challenges.

p.s. I like the way you explained your solution. Also, is it just me, or did you also feel that those formatting difference rejections were frustrating at times? Probably just me :smile:

Steven Parker
Steven Parker
231,275 Points
Steven Parker
Steven Parker
231,275 Points

I don't recall challenges being this specific in the courses I've taken. I think they mostly accepted any method that achieved the required results, which seemed more appropriate.

Caleb Kemp
Caleb Kemp
12,755 Points
Caleb Kemp
Caleb Kemp
12,755 Points

That's good to hear