college_list = ['Dave', 'Jack', 'Josh', 'Donald', 'Carry', 'Kerry', 'Cole',
    'Coal', 'Coala']
for pair in itertools.combinations(college_list, 2):
    similarity = Levenshtein.jaro(pair[0], pair[1])
if similarity >= 0.9 and similarity != 1.0:
    pass
Optimized way to find similar strings in a collection