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Start your free trialJoseph Ferrero
1,308 PointsHello, Can someone explain why this doesnt work? I'm not really sure what else to do. Thanks, Joseph Ferrero
Just need some help
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(topics):
overlap = []
for course in courses:
overlap.append(topics.intersection(course))
return overlap
1 Answer
Chris Freeman
Treehouse Moderator 68,428 PointsLet's look at what your code is doing:
def covers(topics):
overlap = [] # initialize list
for course in courses: # "courses" is not defined. Did you mean COURSES
# 'course' here is each of the dictionary keys
overlap.append(topics.intersection(course)) # intersecting topics set with course name (string)
return overlap
Running this in the REPL returns four empty sets: [set(), set(), set(), set()]
Try these:
- In
for
loop, change "courses" to COURSES - look at both the key and value using:
for course_name, course_topics in COURSES.items():
- perform intersection between
topics
andcourse_topics
- append
course_name