[Pythonmac-SIG] Fast way to get a list of unique values?

[Chris Barker]

Robb Brown wrote:
> I have a large array (Numeric) of integers.  I'd like to get a list
> of all the unique values in that array.  Naturally I'd like to avoid
> a for loop.  Is there an easy way to do this in Python?

I can't think of one off the top of my head, but this would be a good
question for the Numeric Mailing list:

https://lists.sourceforge.net/lists/listinfo/numpy-discussion

I'm sure someone on that list will have a trick up their sleeve.

Also, this would be a good chance to check out Pyrex, rather than C
code, of you really need the speed:

http://www.cosc.canterbury.ac.nz/~greg/python/Pyrex/

-Chris