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Python Python Collections (2016, retired 2019) Sets Set Math

Posted by Soufiane Ez Zine
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Soufiane Ez Zine
Full Stack JavaScript Techdegree Graduate 17,754 Points

set math challenge task 1: need your help!

I tried my code in the workspace, it works just fine. I don't know what am I doing wrong for the challenge. thank you in advance.

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(subj):
    liste = []
    for key, val in COURSES.items():
        if subj in val:
            liste.append(key)
    return liste

1 Answer

Jeff Muday
MOD
Jeff Muday
Treehouse Moderator 28,720 Points
Jeff Muday
Jeff Muday
Treehouse Moderator 28,720 Points

Very close! Since the subj is passed in as a set. We should be checking for an intersection with the set of topics in the course-- see below.

def covers(subj):
    liste = []
    for key, val in COURSES.items():
        if val.intersection(subj): # here is the check for the intersection
            liste.append(key)
    return liste