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

Posted by Mohammad Aslam
Mohammad Aslam
6,053 Points

applying set math to dictionary, lists and sets

Hi there, I am not sure why this is not correct. Python shell gives a syntax error, pointing to the return keyword. Can someone please help? I think I am on the right track.

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(set_of_topics):
    list1 = []
    for key, value in COURSES.items():
        if set_of_topics.issubset(value) == True:
            list1.append(key)
    return list1