4. How do you remove duplicates from a list in Python whilst preserving order?

How do you remove duplicates from a list in Python whilst preserving order?

Answer

down vote accepted

Here you have some alternatives: http://www.peterbe.com/plog/uniqifiers-benchmark

Fastest one:

def f7(seq):
    seen = set()
    seen_add = seen.add
    return[ x for x in seq ifnot(x in seen or seen_add(x))]

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