I am currently working on PSet7: Similarities. I have completed all the tests so far except substrings and I was wondering if any of you could tell me where I am going wrong. I am currently failing all the tests on the substrings portions. Thank you!
def substrings(a, b, n): """Return substrings of length n in both a and b""" truelines =  asubstrings = extract(a, n) bsubstrings = extract(b, n) for i in range(0, len(asubstrings)): for j in range(0, len(bsubstrings)): if asubstrings[i] == bsubstrings[j]: if asubstrings[i] not in truelines: truelines.append(asubstrings[i]) return truelines def extract(string, num): substrings =  for i in range(0, len(string)): substrings.append(string[i:(i+num)]) return substrings