List without duplicates?

[Aahz Maruch]

In article <394FFA1A.FBF8F81D at roguewave.com>,
Bjorn Pettersen  <bjorn at roguewave.com> wrote:
>
>This should probably be a faq by now...:

Yup.

>def unique(lst):
>    d = {}
>    for item in lst:
>        d[item] = None
>    return d.keys()

The Timbot recommends

        d[item] = 1

because there's no lookup involved on 1, so it's fractionally faster.
(Any other constant should probably work the same.)
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