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Wed Sep 14 18:40:35 EDT 2005 · http://mail.python.org/pipermail/python-list/2005-September/339002.html

> I've a list with duplicate members and I need to make each entry
> unique.
>
> I've come up with two ways of doing it and I'd like some input on what
> would be considered more pythonic (or at least best practice).
>
> Method 1 (the traditional approach)
>
> for x in mylist:
>     if mylist.count(x) > 1:
>         mylist.remove(x)
>
> Method 2 (not so traditional)
>
> mylist = set(mylist)
> mylist = list(mylist)
>
> Converting to a set drops all the duplicates and converting back to a
> list, well, gets it back to a list which is what I want.
>
> I can't imagine one being much faster than the other except in the case
> of a huge list and mine's going to typically have less than 1000
> elements.
>
> What do you think?
>
> Cheers,
>
> Robin
>

Hi,

Try this:

def unique(s):
 e = {}
 for x in s:
  if not e.has_key(x):
   e[x] = 1
 return e.keys()

Regards
Przemek

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Removing duplicates from a list