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

Sneha Nagpaul
Sneha Nagpaul
10,124 Points
Posted by Sneha Nagpaul
Sneha Nagpaul
10,124 Points

Prerequisites recursion parsing a json. Help?

Stuck on this exercise for a bit. Please help me debug my attempt.

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()
    # Add title to pres set
    pres.add(data['title'])
    # Call prereqs on the courses on the prereqs - How do I add them to pres?
    for course in data['prereqs']:
        prereqs(course, pres)
    return pres

1 Answer

Sneha Nagpaul
Sneha Nagpaul
10,124 Points
Sneha Nagpaul
Sneha Nagpaul
10,124 Points

Found an old post that dealt with this. Can't figure out how to withdraw the question though.