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 Functional Python The Lambda Lambada Recursion

Posted by white rose
white rose
Courses Plus Student 1,033 Points

Why isn't my code working?

Am I misunderstanding something?

courses.py 
courses = {'count': 2,
           'title': 'Django Basics',
           'prereqs': [{'count': 3,
                     'title': 'Object-Oriented Python',
                     'prereqs': [{'count': 1,
                               'title': 'Python Collections',
                               'prereqs': [{'count':0,
                                         'title': 'Python Basics',
                                         'prereqs': []}]},
                              {'count': 0,
                               'title': 'Python Basics',
                               'prereqs': []},
                              {'count': 0,
                               'title': 'Setting Up a Local Python Environment',
                               'prereqs': []}]},
                     {'count': 0,
                      'title': 'Flask Basics',
                      'prereqs': []}]}


def prereqs(data, pres=None):
    pres = pres or set()
    pres.add(data.title)

    if len(data['prereqs']) > 0: 
        return prereqs(data['prereqs'], pres)
    else:
        return pres

1 Answer

Kurt Maurer
Kurt Maurer
16,725 Points
Kurt Maurer
Kurt Maurer
16,725 Points

Hey there,

You need to implement your recursive functional call into a nested for loop. See the following link that had some significant coverage.

https://teamtreehouse.com/community/im-stuck-with-the-task-3