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

Posted by Jimmy Salazar
Jimmy Salazar
1,358 Points

Help with sets

Hello I'm not all that great with coding and had to find help from a previous post on these forums to get step 1 of this challenge correct. I am stuck on step 2 in which I am suppose to list everything covered in COURSES. Going off the example I figured what I did was along the right line of thinking, but I guess not. Can anyone help me out here?

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(param1):
    r_list = []
    for k,v in COURSES.items():
        if param1.union(v):
            r_list.append(k)
    return r_list

def covers_all(total):
    all_list = []
    all_list.append(COURSES({"integers", "strings"}))
    return all_list

1 Answer

Chris Freeman
MOD
Chris Freeman
Treehouse Moderator 68,441 Points
Chris Freeman
Chris Freeman
Treehouse Moderator 68,441 Points

I believe the challenge checker has changed since you originally posted your question.

In covers, the method intersection should be used instead of union.

In covers_all, the process is similar to covers except a more precise subset check is needed. Use the method issubset instead of the intersection used in `covers.

Good luck!!