Duplicates in lists

Jason Stokes jstok at bluedog.apana.org.au
Thu Mar 9 22:34:51 CET 2000

Matthias Huening wrote in message <8a80a8$8cv8$1 at www.univie.ac.at>...
>Michael Husmann wrote:
>>is there someone who has an efficient function that finds
>>all duplicates in a list?
>What about something like this:
>def dup(a):
>    b = []
>    for x in a:
>        if not x in b:
>            b.append(x)
>    return b

Not very efficient, alas.

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