In Python, what is the fastest algorithm for removing duplicates from a list so that all elements ar

Posted by Jeff Miller on Stack Overflow See other posts from Stack Overflow or by Jeff Miller
Published on 2008-09-18T01:25:21Z Indexed on 2010/04/09 13:13 UTC
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For example:

>>> x = [1, 1, 2, 'a', 'a', 3]
>>> unique(x)
[1, 2, 'a', 3]

Assume list elements are hashable.

Clarification: The result should keep the first duplicate in the list. For example, [1, 2, 3, 2, 3, 1] becomes [1, 2, 3].

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