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Which method should i use to get the child's title?
Should it be itemgetter?
Not sure I understand your question. What the challenge wants you to do it finish the function. Here's one way to do that:
def prereqs(data, pres=None): pres = pres or set() # for each prereq in this courses' prereqs... for prereq in data['prereqs']: # add title of this prereq course, then... pres.add(prereq['title']) # use recursive call to find further prerequisites of this # course, if any prereqs(prereq, pres) # return current return pres
This solution comes from Chris Freeman: https://teamtreehouse.com/community/functional-python-recursion
His is better than the one I came up with, plus it has comments that should be helpful.