Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

Python Object-Oriented Python Instant Objects Method Interactivity

Akshaan Mazumdar
Akshaan Mazumdar
3,277 Points

Exception: argument of type 'NoneType' is not iterable

Seems to not work in the Workspace and I can't figure out what the issue is

class Student:
    name = "Your Name"

    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()


1 Answer

Steven Parker
Steven Parker
216,812 Points

:warning: Be careful about testing a challenge in an external REPL. When you work externally you may not be testing for purpose with the same stringency that the challenge does.

In this case, when the grade is 50 or below, the method needs to "return the reassurance method's result". The code shown here just calls the method without returning the result.