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

Can't find the error

Hi! This is my code for the first step. I've tried it and it seems to work (i've tried it in Pycharm), but the check button says it doesn't get the correct value.

What am I doing wrong? :S

def covers(topics_set): courses_list = [] for course in COURSES.keys(): if topics_set & COURSES[course] == topics_set: courses_list.append(course) else: continue return courses_list

sets.py
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"}
}

def covers(topics_set):
    courses_list = []
    for course in COURSES.keys():
        if topics_set & COURSES[course] == topics_set:
            courses_list.append(course)
        else:
            continue
    return courses_list

1 Answer

I understood the problem wrong.

The code that worked was this one, as the sets didn't have to match exactly, just a part of it.

def covers(topics_set):
    courses_list = []
    for course in COURSES.keys():
        if topics_set & COURSES[course]:
            courses_list.append(course)
        else:
            continue
    return courses_list