Duplicates in lists

[Aahz Maruch]

In article <38C748C7.35162A7B at teleatlas.com>,
Michael Husmann  <michael.husmann at teleatlas.com> wrote:
>
>is there someone who has an efficient function that finds all
>duplicates in a list?  I used a hash which works quite reasonable but
>maybe there is a better way.

If you're already using a dictionary, you'll only be able to do
micro-optimizations; your basic algorithm is the best available in
Python.  If you want us to show you how to optimize Python code, post
what you've got here.
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