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 Python Collections (2016, retired 2019) Sets Set Math


I have written the code and tested it in work spaces (and it works correctly!) but when I type it into the challenge it says bummer: couldn't find covers!

It's been happening a lot to me recently but normally after a few goes it works but this time it's not having it!

Any ideas?

def covers(topic):
    results = []
    COURSES = {
        "Python Basics": {"Python", "functions", "variables",
                          "booleans", "integers", "floats",
                          "arrays", "strings", "exceptions",
                          "conditions", "input", "loops"},
        "Java Basics": {"Java", "strings", "variables",
                        "input", "exceptions", "integers",
                        "booleans", "loops"},
        "PHP Basics": {"PHP", "variables", "conditions",
                       "integers", "floats", "strings",
                       "booleans", "HTML"},
        "Ruby Basics": {"Ruby", "strings", "floats",
                        "integers", "conditions",
                        "functions", "input"}

    for key in COURSES.keys():
        if topic.intersection(COURSES[key]):
    return results

1 Answer

I finally got it working when I moved def covers to below the pre-written dictionary COURSES!