Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

Python Object-Oriented Python Instant Objects Method Interactivity

Posted by Ethan Pyles
Ethan Pyles
2,710 Points

I'm getting Bummer: Exception: argument of type 'NoneType' is not iterable

I guess I have an issue with the way grade is defined.

first_class.py 
class Student:
    name = "David"

    def praise(self):
        return "You inspire me, {}".format(self.name)

    def reassurance(self):
        return "Chin up, {}. You'll get it next time!".format(self.name)

    def feedback(self,grade):
        if grade > 50:
            self.praise()
        else:
            self.reassurance()

2 Answers

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

The message hint is a bit confusing, but the issue is that the method isn't returning anything. The instructions ask that the results of calling the the other methods be returned by the feedback method.

Kevin Yang
Kevin Yang
5,982 Points
Kevin Yang
Kevin Yang
5,982 Points

@Ethan Pyles, Steven parker is right. Just add 'return' in front of self.praise() and self.reassurance() to pass the challenge. Happy Coding!

Ethan Pyles
Ethan Pyles
2,710 Points
Ethan Pyles
Ethan Pyles
2,710 Points

class Student: name = "David"

def praise(self):
    return "You inspire me, {}".format(self.name)

def reassurance(self):
    return "Chin up, {}. You'll get it next time!".format(self.name)

def feedback(self,grade):
    if grade > 50:
        return self.praise()
    else:
        return self.reassurance()