Return the names of all of the courses, in a list by using set() function.

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(course): list_of_courses = [] for subject in COURSES.keys(): if course.intersection(COURSES[subject]): list_of_courses.append(subject) return list_of_courses print(covers({"conditions", "input"}))

def covers_all(topic): all_courses = [] for courses in covers(topic): if COURSES[courses].issuperset(topic): all_courses.append(courses) return all_courses print(covers_all({"condition", "input"}))

Hi all! :) I am trying to return the names of all the courses, in a list if every element of the parameter exists in the values of the object COURSES.

In the second function, I am iterating over the 1st function which returns a list of all the classes. But, the overall result is an empty list :(

Can anyone explains why it keeps executing an empty list?:)

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(course):
    list_of_courses = []
    for subject in COURSES.keys():
        if course.intersection(COURSES[subject]):
            list_of_courses.append(subject)
    return list_of_courses


def covers_all(topic):
    all_courses = []
    for courses in covers(topic):
    if COURSES[courses].issuperset(topic):
        all_courses.append(courses)
    return all_courses