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

Christian A. Castro
Christian A. Castro
30,501 Points
Posted by Christian A. Castro
Christian A. Castro
30,501 Points

Write a function named covers that accepts a single parameter, a set of topics. Any idea what I might be doing wrong??

Thanks!!

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(arg):
    get = []
    for key, values in COURSES.items():
        if values & arg:
            get.append(key)
    return get
covers({'Ruby'})

1 Answer

Iain Simmons
Iain Simmons
Treehouse Moderator 32,305 Points

So, it says that the input to the function will be a set. That means you need another loop inside the one you have to check each topic passed in the input arg, and you want to check if the topic is in values.

Let us know how you go with that, or if you need a little more help!

Also, you don't need to call the function at the end, the challenge system will do that automatically.