def remove_dups ( seq ) : seen = set ( ) seen_add = seen . add return [ x for x in seq if not ( x in seen or seen_add ( x ) ) ]
python list duplicates set
remove duplicates from a sequence preserving order
def remove_dups(seq):
    """remove duplicates from a sequence, preserving order"""
    seen = set()
    seen_add = seen.add
    return [x for x in seq if not (x in seen or seen_add(x))]