Algorithm - How to delete duplicate elements in a list efficiently?

Question

There is a list L. It contains elements of arbitrary type each. How to delete all duplicate elements in such list efficiently? ORDE

Answer 1

One line solution in Python.
Using lists-comprehesion:

>>> L = [2, 1, 4, 3, 5, 1, 2, 1, 1, 6, 5]
>>> M = []
>>> zip(*[(e,M.append(e)) for e in L if not e in M])[0]
(2, 1, 4, 3, 5, 6)