# unique_seq.py -- for python 2.x ^ 2017.09

# unique_seq.py -- for python 2.x

unique_seq = lambda u: sorted(set(u), key=lambda s: u.index(s))

print unique_seq([4, 2, 1, 0, 1, 3, 2])
print unique_seq([3, 1, 4, 0, 1, 2, 4]) # double check